Prince En Arc

The Prince En arc is the fourth story arc in the Beelzebub series. In the Manga, it's comprised of Chapters 77-113 while the Anime adaption follows Episodes 37-50. This arc introduces Baby Be'el's older brother En and his three wet nurses, as well as Zenjūrō Saotome. This arc also details the introduction of Behemoth's 34 Pillar Division.

Synopsis
Spoiler warning: Plot and/or ending details follow.

The Contractor and the Demon Lord
Oga is walking to school with Be'el, complaining in his thoughts about how Hilda just suddenly left despite being Baby Be'el's wet nurse. He also thinks about how he hasn't learned anything about Izuma being a possible Demon. Oga then meets Aoi while walking, but the girl says nothing to him. Oga then gets to the school and finds himself surrounded by a harem of fangirls, all of whom are from the same fanclub that support him and Be'el. The girls are then shooed away by Miki. Aoi then appears and coldly greets Miki but again, says nothing to Oga. The Red Tail then appear and harass Oga for "staring" at Aoi and eventually leave, right after a barrage of insults. Miki then asks if he and Oga can walk home, to which Oga readily rejects. Oga then proceeds to class where Furuichi starts bragging about his own harem of girls, but Oga then starts to ponder what he should do.

In another section of the school, Hidetora Tōjō is shown talking to Shizuka Nanami of the Rokkisei about Izuma classroom, wanting to find and fight Izuma in a battle. However, Tōjō would eventually find Kaname Izuma on the school rooftop. Oga also finds Izuma there and asks Tōjō to leave, wanting to talk to the Horseman alone. Tōjō refuses and Izuma suggests that they all fight together. The three are about to start but then a mysterious man appears, having leaped up to the rooftop from the classroom below after hearing that they were about to fight. He stops them and defeats them all in less than a second. He drags Tōjō and Oga back to class, revealing himself to be Zenjūrō Saotome, as well as the new homeroom teacher for the Ishiyama class. The students are astonished that he could have defeated Tōjō and Oga so easily but Aoi is more curious about Takumi Sadohara and asks why he was fired (something that Sadohara also asks, albeit in the principal's office). However, Saotome simply changes the subject and starts to flirt with Aoi, causing the Nene Ōmori and Ryōko Asuka to get mad at him. Saotome then explains that Sadohara wasn't supposed to be permanent. Afterwards, he then leaves before Tōjō or Oga would awaken. When Tōjō awakens, he leaves to find Saotome but is unable to find the old man. He is soon approached by Shizuka, who then asks him about Saotome. Tōjō confirms that the man has returned.

Saotome is shown atop the roof of the gymnasium where the volleyball match had occurred. He complains how the Zebul Blast used to defeat Kiriya created a transdimensional portal, though he adds that the portal did reduce a high amount of damage that could have destroyed the school. Saotome's contracting seal expands around his arm and he punches through the portal, closing it off. Oga, Tōjō, Izuma, Miki, and Shizuka were all able to feel his Demonic magic. As the portal closes, Hilda suddenly appears and draws her sword. She asks if Saotome is one of Behemoth's men and when Saotome hesitates to answer, she strikes at him. She pins him down and questions his use of Demonic magic which he'd just used to seal the portal. Saotome ignores her and mentions how her underwear is white. Hilda realizes that he can see up her skirt and flusters, allowing him to escape. He then reappears behind her, groping and complimenting her breasts. She frees herself and Saotome starts explaining how he doesn't want to fight her. Hilda notices that she doesn't have to hold back against him and unleashes her own Demonic magic. She tells him to die and their fight ensues. She appears to have an advantage over Saotome until she summons a high amount of magic, to which Saotome then releases his own magic and captures Hilda with a powerful spell. Hilda is astonished, even more so when she notices the Zebul Spell on Saotome's arm. Saotome warns her that if Oga doesn't get stronger, he'll die. He then leaves the gymnasium's rooftop and is confronted by Oga. Saotome tells Oga that he's the delinquent's teacher and that he should go to school tomorrow.

As he leaves, Oga himself is confronted by Aoi. Aoi, dead serious, asks Oga about who Be'el really is. Oga tries to explain the situation to Aoi but cannot figure out how to do so, causing him to let Be'el explain things to Aoi. However, as Be'el is an infant he cannot say words properly. Furuichi, who was watching the three from afar, gets angry and starts explaining when Aoi asks if he knew about Be'el. However, Furuichi proves himself incapable of explaining things either. Be'el is upset that they can't remember and tries running away but a mysterious woman, dressed in the same clothes as Hilda, picks up Be'el and says the Demon Lord's real name. The woman is shown to be a splitting image of Hilda and Furuichi even asks if it's her, but the woman knocks him out for confusing the two. She also turns to Oga and attempts to kiss him.

However, Hilda appears and prevents the act from occurring. She also identifies the woman as Yolda. Hilda says that Yolda is after her and that they should leave, though Yolda objects saying that it's been hundreds of years since they last saw each other. Yolda even pulls her broom, flowing with Demonic magic, but is told by a wet nurse named Izabella to stop, who is with another wet nurse named Satura. Yolda and Izabella begin to argue but are told to stop by a young, green-haired boy with slit eyes. Hilda recognizes and identifies the boy as En, the older brother of Baby Be'el. Izabella summons a throne for En to sit on. En lounges on the throne and is enjoys being pampered by his wet nurses. Aoi asks what happened and Oga explains that it's magic, explaining further that Hilda is a Demon and that Be'el is a Demon Lord. En asks if she is Be'el's contractor but Yolda says that it's Oga, though Yolda does add how Aoi was upset when she tried to kiss him. Yolda then knocks Aoi unconscious. Oga is angered but before he can do anything, Hilda suggests that they go somewhere else to talk.

Meanwhile, Tōjō and Shizuka are both outside near a construction worker's site. Shizuka comments on how cold it is while Tōjō simply says that "he" is late. They are then approached by Izuma, who agreed to challenge Tōjō to a fight sometime earlier that day.

They eventually go to Furuichi's house, taking Furuihci and Aoi along with them. At Furuichi's house (the said resident now being awake), En and his wet nurses explain how the Great Demon Lord wanted to destroy humanity, but forgot that Be'el was already sent to do the job, and sent En to do the job. Oga comments on how random the Great Demon Lord can be and goes on further to even insult En, to which Yolda attacks him with her broom. Izabella then states that they're only there to extract information and Hilda then asks what will happen to them, now that En is to finish Be'el's job instead. She does not receive a proper answer, however. When En and his wet nurses decide that it's time to leave, the Demon Lord tries to say goodbye to his younger brother but Baby Be'el starts throwing ice cubes at him. En starts crying and causes the area around him to burn. His wet nurses try to comfort him but when all seems to fail, Satura requests that Furuichi bring En games. En starts cheering up and brags about how much of a game player he is. However, he doesn't recognize what a PS2 is and finds himself losing to a game of Biohusband 4 (a parody of the Resident Evil franchise). En decides to spend the next day playing various video games and prepares to leave with his wet nurses. Before they do leave, however, Izabella explains to Hilda that while they're fine with En and Baby Be'el destroying humanity together, whoever proves more powerful will be the rightful heir to the throne. One of the people supporting En in this campaign is also said to be Behemoth, a very powerful Demon. En warns them that Behemoth's men will be after them and that they should try to stay alive.

He and his wet nurses then leave, using a car for transportation. While in the car, Izabella asks why En doesn't want to live with his younger brother and his told that En refuses to live among commoners. He and the Demon Maids discuss their plans to destroy humanity and how Behemoth will be very angry with En if he doesn't do anything.

Behemoth's 34 Pillar Division
Meanwhile, Aoi finally awakens and decides to leave. Oga, Hilda, and Baby Be'el accompany her as she walks home. While walking, Oga notices how very uncomfortable the silence is and tries to enlighten the mood by having Be'el sing, to no avail. Hilda thinks about En's words, causing her to wonder about Behemoth and Saotome. Suddenly, Aoi stops and thanks Oga for walking her home. She then leaves, causing Oga to wonder what's happened to her. As Aoi is walking away, she notices some Demonic power falling from the sky. She then disappears, causing Oga to wonder where she went. Afterwards, Hilda suddenly pushes Oga and Be'el down while a blast of Demonic power is sent after them.

A Demon appears, worrying Hilda as she didn't expect one of Behemoth's men to be appearing so soon. She tells Oga that Behemoth's 34 Pillar Division is one of the main fighting forces in the Demon World but the Demon corrects her by saying that they are the best. He then appears with Aoi caught in his Demonic magic and identifies himself as the 8th Pillar General of Behemoth's 34 Pillar Division, Hecadoth. Oga ignores his introduction and angrily asks why Hecadoth has Aoi, to which the Pillar General replies that he needs a Human contractor to fully harness his powers. He also adds how he's the first to have his contractor in the Human world, shocking Hilda that other members of the Pillar Division have arrived. Hecadoth then asks Oga if he knows the requirements for making a contract with a Human, but Oga doesn't know the answer to that. Hecadoth tells him that it's blood, causing Oga to wonder when he's ever made such a contract with Be'el. However, Hilda then whispers a plan to Oga: she will distract and fight Hecadoth while Oga rescues Aoi. Hecadoth hears this and questions whether Hilda can really beat him while uncontracted. Oga then says that he rejects Hilda's plan, shocking her, and says that he'll beat Hecadoth instead. The two then start arguing about what to do before Oga finally agrees to let Hilda help him. Hecadoth says that he already knows their plan and Oga then starts launching an attack at him, using Baby Be'el's electricity. Hecadoth dissolves it, complimenting Oga for his use of Demonic power. Oga retorts by saying this is the first that he's ever used them consciously and launches another attack, but Hecadoth also dissolves it by slamming and compressing his power into the ground. Hilda then appears behind the Demon and cuts the string of Demonic power used to hold Aoi, allowing Oga to catch the Human girl. However, Hilda is then stabbed by Hecadoth's spear who reveals that this was his plan from the start. As Hilda collapses, Hecadoth states that he doesn't care for Aoi as Hilda is the biggest threat to En. Aoi then awakens and notices Hilda on the ground, injured. Oga tells her to heal Hilda and that he'll explain the situation to her later, preparing himself to fight Hecadoth alone.

Around the time that Hecadoth appeared, Tōjō and Izuma have continueed their fight but both have begun to feel worn down. Izuma compliments the Tōhōshinki, saying that he's never had to get serious in a fight before. Tōjō contradicts and states that they're both just warming up. Izuma ignores this and starts unleashing Demonic power. Tōjō is stunned by this, as well as Shizuka, but Izuma ignores both of their expressions and starts to attack Tōjō. Some time later, Kanzaki arrives at the scene after buying himself some yogurt. He meets Yuka hiding behind some stacks of wooden planks. The two converse and Yuka informs Kanzaki of the situation, explaining how Izuma has started to gain an advantage in the fight ever since he's started using his Demon powers. Izuma tries to end the fight and thanks Tōjō for the battle but suddenly, he is kicked by a tall man wearing the same outfit as Hecadoth. Izuma collapses and the man appears alongside a small boy with the same outfit, telling the latter that it was pointless coming here. The boy says that Izuma was probably the descendant of a Demon who escaped to the Human world. The two are then identified as Pillar General Graphel and Pillar Baron Nāga. The other Humans are surprised by what had happened, as well as confused as to what Nāga was talking about. Izuma, fallen on the ground, remembers the deal that he made to the Saint Ishiyama principal and silently apologizes to him. He then gets up, to which Graphel states that they're not on equal footing. When Izuma refuses to submit, the Pillar General attacks and pins the Rokkisei member and  repeats his words. He then tries to kill Izuma but is stopped by Tōjō who headbutts him, saying that Graphel shouldn't take away his "prey". The two then start fighting and Tōjō, nearly on the verge of death, is told by Kanzaki to stop and that he will take care of things. However, Kanzaki only asks what school Graphel is from and that he will defeat him, receiving much cheer from Yuka.

Oga and Hecadoth continue their own battle but Oga is at a clear disadvantage, the latter realizing that himself. Aoi screams for Oga but is told not to interfere. Hecadoth then dashes towards Oga and stabs him with his spear. Pierced, Oga then grabs the spear and charges some of Be'el's power onto his arm which he then uses to punch Hecadoth. After a massive explosion, Hecadoth emerges with just simple marks on his cheeks. Oga is stunned by this, even more so that Hecadoth blocked the attack barehanded. As Hecadoth prepares to kill Oga, Saotome suddenly appears and punches Hecadoth away before introducing himself as Oga's teacher.

Hecadoth tells Saotome that whatever the reason, he won't go easy on him. Saotome makes a quick insult at the Demon before commenting how he "bullied" some of his students. Hecadoth, sensing Saotome's power, decides to get serious and asks for Saotome's name while simultaneously threatening him with his spear. The teacher asks if the Pillar General was ever taught manners and the two then engage into battle. Saotome manages to land a powerful punch at Hecadoth's face and activates his Zebul Spell, drawing the attention of Graphel and Nāga who then leave to find Hecadoth. Hecadoth is shocked that Saotome has such immense power for a Spell Master but is even more surprised upon recognizing the mark on his hand. Hecadoth is about to name the Demon who contracted with Saotome when Graphel and Nāga arrive, telling Hecadoth that they must fight the teacher altogether. As they connect their powers, Saotome tells Oga to listen as he gives a "lesson" and charges strong Demonic power from his Zebul Spell and fires a powerful attack at the three Demons. However, the three manage to escape the attack before they can get injured and disappear back to the Demon World.

With the three Demons gone, Saotome informs Oga that Hilda can die if her wounds aren't properly treated. However, Alaindelon appears and splits his body, revealing two familiar faces: Furcas Rachmaninoff and Lamia. The two treat Oga's and Hilda's wounds at their house. Aoi, Alaindelon, and Saotome accompany them. After dealing with Hilda's wounds, Furcas states that while she's in bad shape she will survive. Lamia and Aoi are relieved especially the latter, who feels guilty that Hilda was hurt because of her. Saotome reassures her and tells Oga to come to school the next day, as that's when he can train him properly. Furcas says that the job may be troubling to Saotome who shrugs it off, saying that he's under orders by the Saint Ishiyama principal. He then leaves. Aoi prepates to leave but not before a brief talk with Misaki, the first head of the Red Tail, who tells Oga to take Aoi to her house. Meanwhile, Oga is healing up in his room where Hilda is also recuperating. There, Hilda apologizes to him for burdening him and Baby Be'el.

Afterwards, Oga (along with Be'el) takes Aoi home with his bicycle. There, while complaining how everyone keeps interfering with his problems, Aoi asks about Be'el. Oga explains the situation to her and says how furious he is that he can't protect anyone. He adds how everyone just makes him even madder and promises to get stronger. The three then arrive at the temple where Aoi lives and they are confronted by her grandfather, Ittōsai Kunieda. Oga recognizes Ittōsai and after remembering the old man's offer from the previous summer, demands training from Ittōsai.

The next day at school, Yuka starts talking about Kanzaki's encounter with Graphel and Nāga though Himekawa rebuffs them. The other delinquents in the class start talking about how Izuma, Tōjō, Aoi, and Oga are all absent. Saotome is only annoyed by Oga's absense, however.

Searching and Training
Oga starts having a dream where he's in trial with several characters (ranging from Humans to Demons) where they discuss how Oga's character has gotten much weaker as the series progressed. Oga tries defending himself on numerous occasions despite knowing that this is all a dream. Eventually, the dream ends and Oga awakens in his home. He then walks from his house with Baby Be'el, feeling incredibly groggy from his dream. Along the way, he meets and beats up three local delinquents. As he beats them up, he talks about how weak he's gotten before leaving. Oga then arrives at Ittōsai's and Aoi's home. The old man is surprised that Oga arrived but Aoi is even more shocked; her grandfather tells her to get to school but Aoi flusters and states that it doesn't matter right now. Oga notices that Aoi called Ittōsai her grandfather, worrying Aoi as the last time she'd said that was when she was in her disguise. Her younger brother, Kōta Kunieda, then arrives though neither Oga nor Be'el were surprised. Oga goes on to state that Aoi is the cousin of 'Aoi Kunie' though Aoi is both relieved and shocked that he was too dense to realize the truth. Ittōsai then tells Aoi that she can stay with them to train, saying that she hasn't done much since the Saint Ishiyama Festival.

In his office, Saotome receives a text from Oga saying that he's training with Aoi. Although initially angered, Saotome then realizes that Aoi's grandfather Ittōsai is a master of the Shingetsu style and decides to let Oga train there. He is then approached by Tōjō and replies back to the Senior, albeit somewhat coldly. Saotom then explains the situation regarding the Demons with Tōjō who is confused by everything, much to Saotome's chagrin. Although Tōjō fails to comprehend anything, Saotome decides to train him to fight Demons anyway as he's already involved (and also because he can't train Oga, leaving him with extra time on his hands).

Meanwhile, Hilda is still in Oga's room where she is recuperating. She talks with Lamia, who is relieved that the Demon Maid is all right, and Furcas, who tells her that because Hecadoth stabbed her with his spear, which has the power to diffuse any form of Demonic magic, Hilda won't be able to use any spells. Hilda understands this and says that she needs to think of a plan in the one week needed for her to fully heal. She then turns to Lamia and asks the young Demon girl to find En, even though she hasn't yet located the Demon Lord. She then shows a text message received from En, which simply states how much he loves net games. Lamia is dismayed by it and decides to help find En, although she does admit how she's not really on good terms with him.

Oga then begins his training with Ittōsai but he remarks how everything he's doing, which is polishing floors, is nothing more than cleaning; Ittōsai remarks how this is a part of Oga's training and how it'll help in the future. As he leaves, Aoi tells Oga that he should just follow Saotome's training as it is much better. Oga objects thinking that it is training, believing it to be a method often used in movies based on martial arts (where simple tasks make the person stronger) though Aoi still thinks that they're just chores. Be'el is also training to get stronger and tries to compete with Kōta but ultimately fails, instead electrocuting Oga. Afterwards, Oga starts sweeping the garden outside, along with Aoi, and says how he's understanding the concepts but then disregards it (along with Be'el who is copying the delinquent's actions), much to Aoi's disbelief. Oga then finds Ittōsai and complains to him that he's not learning anything. However, he gets back to sweeping the leaves when Ittōsai says that he can leave at any time. Soon afterwards, Teimō's Shadow Force arrives also seeking training from Ittōsai and asks to meet him upon noticing Oga. Upon recognizing the delinquent, they are surprised, then angered when he fails to recognize them. They abolish the pile of leaves that he'd been sweeping, angering him, and causing Oga to attack them with his broom. He then believes that he's learned a fighting method but is annoyed when Ittōsai corrects. Oga is finally exasperated when the old man tells him that Oga's "training" was all for baked potatoes, which Ittōsai shares with the Shadow Force.

The next morning, Furuichi awakens from a dream to find Lamia on top of him, telling him to help her find En. She tells him that he's the only one who can help her but Furuichi knows that there are secrets being kept from him, causing to get angry. His younger sister Honoka then arrives in his room and finds him and Lamia in a lewd position, causing her to accuse her brother of being a pervert and to consider calling the police. Lamia decides to inject Honoka with a memory-altering chemical but Furuichi manages to convince the Demon to explain everything instead, but Honoka fails to comprehend anything. Furuichi and Lamia then decide to leave where Lamia informs him of the situation, in turn being asked as to why she's coming him for help. Lamia explains that Furuichi is the most-likely person to know of En's location and that he's also the only Human she knows who can help. Afterwards, she then informs him of Oga's and Aoi's training preposition, but Furuichi believes this to be them on a date together much to Lamia's disgust.

Ittōsai takes his grandchildren, along with Oga and Baby Be'el and the Shadow Force to Mapputatsu Temple where they can begin their training. They are forced to take a train ride, however, and the trip initially feels chaotic (as noted by Ittōsai). Once they arrive, Aoi reminisces on the aura she felt during the summer. Ittōsai explains to the teenagers (and infants) about the tengu that live around the temple and that they shouldn't get lost unless they want to die. The group then arrives at a waterfall where Ittōsai tells them all to find a stone. They all do (with varying shapes and sizes) and tells them all to break them with their bare hands otherwise they'll go without dinner. The male delinquents are all shocked by this but Oga attempts to break the boulder he carried anyway, with the results only being an injured hand and Oga complaining to Ittōsai. Ittōsai then asks Aoi to demonstrate for everyone and she manages to break the stone into two with just her hand, as her grandfather had told her to. Her grandfather then explains that the technique is Nadeshinko, a technique that falls under the Shingetsu style that he specializes in, and the qualities needed to master it. The male delinquents are too distracted by Aoi's use of Nadeshinko, however, that they completely ignore him.

Furuichi and Lamia are then seen at a game corner where Furuichi is catching a stuffed animal from a toy crane for the female Demon. However, he is revealed to have forgotten about trying to find En, disappointing Lamia. He then starts wondering what the two were originally doing and comes to the conclusion that they were actually on a date, but then he starts fantasizing about a date with Hilda if he'd given her the stuffed animal instead. Furuichi then decides to steal back the stuffed toy from Lamia, deciding to do so by impressing her, by talking about how En wouldn't be at the game corner that they're in because it's full of good-for-nothings. He then catches the attention of Hajime Kanzaki, who was playing the slots. They are then approached by Shintarō Natsume and Takeshi Shiroyama, who bring Kanzaki his yogurt. Kanzaki explains how the game corner is his 'kingdom' causing Furuichi and Lamia to ask him if he's seen En before, to which he replies that he did. Kanzaki then leads the two to a section of the game corner where he finds Yuka, whom he nicknames "Paa-ko", while asking why she's in his 'kingdom'. Yuka says that she's just there to play and when asked, says that she's seen En before and how he's beaten her in the past. Suddenly, much to everyone's shock, it's revealed that Himekawa is also there.

Meanwhile, Oga and the Shadow Force continue their training where each member of the Shadow Force is beginning to break their stones, having finally understood the basics. Aoi tells Oga that if he doesn't improve on his strategies, he's going to be the only one to miss dinner. Oga notices how he can't feel anything just from hitting the rock and is suddenly being taunted by Kōtarō Mikagami and Takumi Dezaki, the former then agreeing to help Oga. Oga, having been annoyed to his breaking point, then uses Mikagami's head to smash the boulder into two and is granted dinner by Ittōsai, though the old man notes how Oga failed to complete his method.