Assassination Classroom

A powerful creature claims that within a year, Earth will be destroyed by him, but he offers mankind a chance by becoming a homeroom teacher where he teaches his students about how to kill him. An assassination classroom begins.

Assassination Classroom is a 2015 fantasy animation movie, starring Luci Christian, Bryce Papenbrook, Jun Fukuyama. It holds an IMDb rating of 7.9/10 from 28,740 votes and runs 23m.