The Assassins Aren't Guests

is episode 40 of the Beelzebub anime.

Summary
While Oga and Hilda catch up on chores and Aoi look up demons in the library, the three bump into each other late at night. As they head home together, Hecados attacks Oga and the gang, and he takes Aoi as his human host. Meanwhile, Toujou and Izuma have a match to fight. Can Oga and Hilda defeat Hecados and save Aoi?

Next episode preview
Kanzaki sings about spinning Yogurty. Yuka tells him that it's not a good time to sing about it and tells him that "Oga's wife" and Aoi are in a pinch. Kanzaki becomes excited about their rivals and asks her which school they are from. Yuka claims they're as strong as oni and that they're in a desperate situation. After she introduces the next episode, Kanzaki tells her not to worry as he'll beat them. Yuka becomes excited and starts to admire him.

Characters in order of appearance

 * 1) Tatsumi Oga
 * 2) Beelzebub IV
 * 3) Izabella (flashback)
 * 4) Hilda (flashback)
 * 5) En (flashback)
 * 6) Takayuki Furuichi
 * 7) Aoi Kunieda
 * 8) Yuka Hanazawa
 * 9) Hidetora Tōjō
 * 10) Shizuka Nanami
 * 11) Zenjūrō Saotome
 * 12) Satura
 * 13) Yolda
 * 14) Hajime Kanzaki
 * 15) Tatsuya Himekawa
 * 16) Kaname Izuma
 * 17) Hecadoth
 * 18) Oga's Mother