Assassination Classroom The Movie: 365 Days' Time

A single school year leaves a lasting mark on Class 3-E of Kunugigaoka Junior High—especially the one spent under the guidance of the eccentric Koro-sensei. Now alumni Nagisa Shiota and Karma Akabane step back into their old classroom, letting familiar sights like the desks, chalkboard, and class album draw them into memories of the days that changed them.

As they look back, the pair revisit how that unusual time shaped them into would-be assassins and readied them for life beyond school. At the center of it all is their octopus-like teacher, who began their lessons with an impossible ultimatum: kill him by the end of the year, or he will destroy the world.