Ciel Phantomhive went to Hell after being turned into a demon learning many things from Sebastian such as magic, combat skills, and 'normal' human things like history, languages, ect. ect. over a few years. He comes back after traveling the world and goes to Japan after learning the world will blow up after awhile by a certain octopus who blew up 70% of the moon and is now a teacher. He may also meet someone he thought he wouldn't see in a long time. Black Butler/Kuroshitsuji and Assassination Classroom/Ansatsu Kyoushitsu do not belong to me but the original owners. I hope you will like the book, I haven't watched Assassination classroom (AC) in along time so I'm going off my memory it won't have exactly what they say either please enjoy. :3 Warning: Small cursing here and there