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A mysterious creature destroys 70% of the moon. The creature then warns that if he is not destroyed by March of next year, Earth will be next. The creature also demands that he becomes the homeroom teacher for 3rd grade E class at Kunugigaoka Junior High School. The government is powerless to say no. The creature then becomes the homeroom teacher of 3rd grade E class which consists of failed students including Nagisa Shiota. The creature is called Teacher Koro. Meanwhile, the government requests that the students try to kill Teacher Koro even though he possesses super powers. The government offers a 10 billion yen reward for whomever successfully kills him. The students are confused by the situation, but decide to kill Teacher Koro. When their class begins with Teacher Koro, the students finds themselves having a good time with their new teacher.
In an era where aliens have invaded and taken over feudal Tokyo, a young samurai finds work however he can.
Story continues with the students' own conflicts, Koro Sensei’s identity and the fate of the world. The time limit for assassination is approaching.
Keiko, a lonely single woman living in Tokyo, is taking the elevator up to her apartment one day when a couple of young thugs suddenly appear. They immediately assault her, dragging her into a stairwell and taking photographs of her in the throes of her ordeal. She leads them to an apartment inhabited by Miho, a woman she often sees in the building. The men burst in and, after repeatedly beating Miho’s partner, subject both women to endless rape and degradation. In the midst of their mutual torment, the hatred that Keiko and Miho share for each other explodes, revealing them both to be as ruthless as their captors.
