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Class 3-E is the lowest class at Kunugigaoka Junior High School. It is also the location of a government confidential assassination of their homeroom teacher, a powerful yellow octopoid creature who threatens to destroy the Earth.

Despite the hefty reward of ¥10 billion, it soon dawned onto the students that it is an almost impossible mission. One, their homeroom teacher has several super powers at his disposal, capable of moving at Mach 20. Two, he is invincible. Three, he is also the best teacher they ever had.

Will the students succeed in their mission to assassinate their invincible teacher before it is too late?