Assassination Classroom (Seasons 1–2)

Assassination Classroom (暗殺教室, 2015) is a Japanese anime you can watch online on iFILM. A grinning, tentacled creature has already blown away most of the Moon and given humanity a deadline: kill him within a year, or Earth is next. His chosen hideout? A junior-high classroom, where he takes a teaching job.

The students of Class 3-E, the school's designated dead-end group, get a job no other class in the world has: assassinate their homeroom teacher before they graduate. The catch is that he moves at Mach 20, regrows any limb you cut off, and happens to be the finest mentor any of them have known. He drills their math, exposes their weak spots, and shields them from the bullies upstairs. Armed with anti-sensei knives and BB rifles, the kids slowly realize they don't actually want to pull the trigger.

Adapted from Yusei Matsui's Weekly Shonen Jump manga and animated by studio Lerche, the series pulls off a strange trick: a comedy about contract killing that turns into a genuinely moving story about growing up. Stream Assassination Classroom (2015) online on iFILM.