A class of junior high "misfit" students who are tasked with assassinating their new teacher, an octopus-like creature nicknamed Koro-sensei, who destroyed the moon and threatens to destroy Earth in a year. The students have to learn to balance their assassination attempts with the lessons from Koro-sensei, who is surprisingly an excellent teacher, while the government offers a ¥10 billion reward for his head. Each episode often focuses on individual students, their growth, and their internal conflicts between wanting to kill their teacher and growing to care for him.

In this anime anthology, a salvage ship crew happens upon a haunted vessel in "Magnetic Rose"; a cold tablet turns a lab worker into a biological weapon in "Stink Bomb"; and an urban populace carries on an endless war with an unseen foe in "Cannon Fodder."

6个16岁的花季少年在放学后开始他们的幸福生活，都是10多岁、20岁的话题，第一次爱情(first crush)，第一次打工(first job),第一个银行账户(first bank account)太多的第一次，一切生活才刚刚开始。Enjoy it and Having fun! 另：画风很类似迪斯尼的Kim Possible。 by sonychen