Akumano Academy Arc

The Akumano Academy arc is the fifth story arc in the Beelzebub series. It is composed of Chapters 114-138 and Episodes 51-60, though the anime adaption does not cover all chapters due to its cancellation. This arc details how the Ishiyama students and members of Behemoth's 34 Pillar Division are at war with one another, due to a conflict between En and Furuichi. It also introduces several of Behemoth's men, as well as hints regarding the histories of several other, powerful adults.

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

Initial Preparations
Now fully aware of the recent events, Zenjūrō Saotome starts scolding Oga for using Super Milk Time too much. He comments how severe the consequences are and how lucky Oga is that nothing else happened besides switching bodies, then telling him to try and remember what happened during their training in the mountains. However, Oga can only recall fragments: as he was preparing the milk, Baby Beel and Black Baby Beel kept arguing and fighting over who would drink it causing Oga to drink the milk instead, seeing it as a form of punishment. Oga finishes by saying that's all he can remember. Saotome wonders why Oga would use the technique in a real battle if he couldn't even remember his actions while using Super Milk Time before, to which Oga replies that he thought it was a good fighting move if it was able to do serious damage to Saotome. Saotome sighs in exasperation but then shrugs it off. He tells Oga that what's done is done and that now, he must start perfecting Super Milk Time for the when Behemoth's men arrive, as Oga cannot battle and be unconscious the entire event. Saotome even mentions how Hidetora Tōjō and Kaname Izuma are training as hard as they can, and that at the rate they're going, both are likely to surpass Oga. Hearing this, Oga then asks Saotome about the side effects of switching bodies from overusing Super Milk Time, to which Saotome says that he doesn't want to know more about, but adds by saying that if a worst case scenario was to happen, they'd have to reduce the amount of time needed for their bodies to return to normal. After asking, Oga then learns that Black Baby Beel is actually in the room, playing chess under the desk, and how Saotome had to take him with him as he couldn't let the shadowed entity stay on Mapputatsu Mountain.

At the same time, having finished fighting with Hilda, Aoi returns to her homeroom, looking tired and ill. Himekawa, Kanzaki, and the Red Tail then give further detail about their video game fight with En and his three wet nurses with Aoi, who only knew about Himekawa's apartment being destroyed. Afterwards, after being repeatedly asked, she allows the Red Tail to continue having their meetings at her shrine.

After school, she walks with the Red Tail to her home but then starts to leave for training in the dojo. As she leaves them, the Red Tail all talk about their plan to bring Aoi back into their group and enter the dojo. They meet Ittōsai Kunieda and Teimō's Shadow Force, where Nene attacks the Shadow Force after believing that they're trying to pursue Aoi. Aoi then reappears with Kōta wondering if the two groups are fighting, to which the Shadow Force hastily denies. Eventually, the Shadow Force leaves for the day and Nene asks why Aoi is letting them into her house. Aoi explains how they're her grandfather's new students, but she then changes the subject and asks why the Red Tail isn't holding a meeting like they said they would. Aoi begins to ask them if they're trying to persuade her back into the Red Tail and as Yuka and Ryōko were trying to explain everything, she gets up and leaves. Outside, she silently apologizes how she can't get them involved in her fights anymore now that she's preparing to fight actual Demons. Afterwards, Alaindelon leaves him as well.

Suddenly, a mysterious voice starts talking to Aoi but she starts to snap at it, causing the voice to say how her attitude is what made him keep quiet about their situation. It adds how Aoi nearly revealed the truth to Hilda but Aoi says that it's all right if she knows. Aoi then enters a house near her own, in which Isafuyu is currently an occupant. After brief chit-chatting, Isafuyu compliments Aoi for conquering "him" but Aoi replies that it's because of Isafuyu that she was able to do so.

After a brief distraction made by Black Baby Beel during her training, Aoi was taken by Isafuyu to a small temple where a tengu dwells. Isafuyu says how she frequently visits the tengu when she is about to perform exorcisms. Upon reaching the temple, Aoi is attacked by a powerful gust of wind but she manages to dodge it. Then, a voice comes from the temple scolding Isafuyu for bringing another Human to the area. Isafuyu tries to improve the situation by introducing Aoi and explaining everything to the tengu ; however, the tengu dismisses her words and even says how he'll never give her any more of his powers. Aoi defends Isafuyu, gaining the tengu's interest after it realizes that she can hear him, and decides to test her. However, his first question is Aoi's measurements and when she doesn't answer, he begins insulting her. Isafuyu explains how he tends to ask her very personal questions and when Aoi, who is stunned that Isafuyu answers the questions, starts arguing with the tengu it asks about the color of her underwear. Visibly annoyed, Aoi grabs a tree branch and uses Nishiki Hyakka Midare Zakura repeatedly against the temple and eventually destroys it. The tengu then reveals himself to be a bipedal dog and surrenders out of fear for what Aoi is doing. Aoi and Isafuyu are speechless by how it appears and Aoi questions whether he's really a tengu. The creature replies that the word is written in the same manner as a komainu, which is what he really is. Aoi then beats him up and the komainu, named Koma, pledges loyalty to Aoi under the agreement that for doing whatever she asks of him, she must give him her underwear. Aoi hits him with her branch and leaves with Isafuyu.

Back in the present, Aoi continuously thanks Isafuyu for helping her control Koma as he now listens to everything she tells him. However, due to Koma's perverted nature, he still manages to bother Aoi with his words and actions.

In the meantime, far above in the Mapputatsu Mountains, Furuichi is doing his own training. However, do to his lack of experience in fighting and overall strength, Furuichi decides to give up his training and tells Lamia and Alaindelon that he's more of a cerebral-type of person. Hearing this, Lamia decides to leave and says that she'll be back in a week. She also tells Furuichi how guilty she felt for getting him involved with Behemoth and his men, but since he's going to be protected anyway, she just feels stupid for even worrying about him.

Oga is reading Gohan-kun manga when Hilda appears, telling him that she'll be looking after Baby Beel for the rest of the day. This surprises Oga, who asks why she's trying to help out and comments also that she should help out more often. Hilda suddenly snaps. She angrily tells Oga how serving Baby Beel is her purpose in life and how being apart from him, for whatever reason it may be, breaks her heart. She then asks him why he said how he'll never let Baby Beel destroy humanity, something that immediately made him an enemy of the entire Demon World. Oga simply replies that the words just came to him. This infuriates Hilda and she starts beating him up until Misaki arrives with 'super spicy' habanero meat buns for them all to eat. As they're eating, Misaki tells Oga how Ishiyama High School is almost done rebuilding.

Demon School
In the meantime, Ishiyama High School has finally been rebuilt and the delinquents in the Ishiyama homeroom are all excited about it. Kanzaki comments how childish his classmates are being but when they start talking about who can vandalize the school first, he joins them in their excitement. Nene sighs at her fellow delinquents. Then, she starts thinking about how she'll miss Saint Ishiyama Academy when she and the others leave. Kaoru Umemiya then mentions how the school finished rebuilding in only three months, surprising Nene. She ask Himekawa if schools can be rebuilt in that amount of time and if he had any involvement in the matter. He replies with a no to each questions.

An elderly man is shown walking the hallways of Saint Ishiyama Academy. Ichirō Shinjō and Hiromichi Gō approach the man and tell him that he needs to remove outdoor shoes when inside the building. The man apologizes, removes his shoes, and asks where he can find the classroom for the Ishiyama delinquents. The two Rokkkisei tell him not to go there and in response, the man slaps them both with his shoes and asks where he can find Oga. Suddenly, Oga appears with Baby Beel on his shoulders. The man identifies Oga after seeing Baby Beel. However, Oga denies his identity and starts walking away. As he walks, he starts complaining about how he already has problems with Behemoth, Behemoth's men, as well as the fact that Tōjō and Izuma are all getting stronger and stronger. He then asks Baby Beel if he'd like to surpass all of them.

The mysterious man then appears on the school's gymnasium, telling himself that he can't find Oga and how fun the delinquent is. He then turns around and sees Zenjūrō Saotome, Ittōsai Kunieda, and the Saint Ishiyama principal Genma Isurugi. After a cold greeting, Saotome asks what the man wants with Oga. The man notices that Saotome has been helping Oga and explains how he's only here because he wants to greet them. He then adds how much Ittōsai and Genma have aged since the last few decades. The latter two shrug it off. Genma suddenly bulks up and says that, since the mysterious man just came to greet them, he should greet him in return. Genma attacks the man and creates a wide crater on the gymnasium rooftop. Ittōsai then uses Oracle but the attack is also dodged. The mysterious man says how he's only there to greet them but Saotome, activating his Zebul Spell, argues by asking the man if he's actually there to declare war, calling him Behemoth. Hearing this, Hilda, who was actually eavesdropping on the four men from the school rooftop, is shocked to learn that Behemoth is there. When Oga arrives at the rooftop, she pulls him aside and wonders if he even sensed the high amount of Demonic power from the area. In response to Saotome's words, Behemoth says that he's not there to declare war (yet). He explains how he just built a school in the Human World for En, as the Demon Lord still has things that he needs to learn more about.

Meanwhile, the Ishiyama delinquents decide to check out their new school but before they do so, Kanzaki has them thank Sadohara (who's still substituting for Saotome) for everything that he's done for them. They then leave, except for Himekawa who decides to get to the school via helicopter. With a loudspeaker, he tells them that he will be the first person to step foot on their new school. Eventually, the other students arrive at the school and are awed by how extravagant it appears. Kanzaki prepares to vandalize the sign that reads the school's name. However, construction workers arrive and remove the sign before he can do so. Nene asks what they're doing and the workers inform the students that Ishiyama High School has switched campus locations with another school: Akumano Academy. As the construction workers set up the new sign, all the present delinquents remain shocked from the news that they just heard.

Suddenly, Furuichi arrives after being transported there by Alaindelon. He sees the expressions on their faces but is oblivious to the actual reason. Thinking it's because he's still wearing the clothes from his training, he denies what he was initially doing prior and then tries explaining to them that Akumano Academy doesn't actually exist. However, he then notices the new sign for the school and upon seeing En's face carved, yells out in disbelief. The other students then think about what to do next and Yuka suggests that they break into the school, to which everyone agrees to. As they walk on the school's campus, with Furuichi fruitlessly telling them to go back, they meet Himekawa who tells them of an unlocked door to the school. Yuka asks if Himekawa really did make adjustments to the school's design, which he again denies, and the delinquents all start walking around the campus where they find various statues of En everywhere. Himekawa tells the others how he did research on Akumano Academy and found that there is no history of it whatsoever, and suggests that they enter the school building and check things out. Furuichi objects but Ryōko tells him to just come along, calling him a pedophile again. The students enter the building and are astonished to see that the interior is just as extravagant. As they walk around, Yuka notices that the entrance door closed itself but is told not to worry about it. Kanzaki then notices how there isn't even one stairway that leads to the other floors of the school. Hearing this, Furuichi urges the others to leave immediately, but is ignored. Himekawa then notices how there's less people with them than before. The group then notices someone behind them and meets three Pillar Generals: Agiel, Odonel, and Zela. Agiel identifies the delinquents as Baby Beel's men, thinking that they're the ones who defeated Graphel and [[Hecadoth]. She does note how weak they are, however. Nene starts chastising Agiel for her wardrobe and asks if they're from Akumano Academy. Agiel does not recognize the name until Odonel points it out to her. Two of the delinquents start making comments about Agiel's appearance and she flicks them both in the head, which is enough to send both flying and crashing headfirst into concrete walls. She then says how entering their school is illegal and Nene restrains Agiel with her chains, but the Pillar General easily breaks through. Agiel begins drawing her sword and lunges at Nene.

However, Aoi appears, having been brought to the school by Koma, and saves Nene from being attacked. Agiel questions who Aoi is and takes note of how people aren't even supposed to enter the school anymore. Aoi replies by saying it only applies to normal people. Suddenly, Koma's voice is heard and he reminds Aoi how she initially didn't sense the Demons' presences. She admits and then tells Nene and the others to escape. While the Pillar Generals wonder where Koma's voice came from, they then see a monstrous form of Koma appear before them. Koma mentions to Aoi how it's actually their first battle together.

Manga and Anime Differences

 * In the anime, there was a major change in the story following Chapter 121 of the manga. After Hilda was swallowed whole by Sodom, Oga and Baby Beel synchronized and defeated the dragon eventually freeing Hilda. Thus, she was not captured and so the following chapters were not depicted. The reason behind this is the cancellation of the Beelzebub anime.