The moon suddenly shrinks to 70% of its size and becomes permanently crescent-shaped. A mysterious force is behind this catastrophic event. The students of E Class, Kunugigaoka Junior High School, learn that their teacher is the culprit. The teacher, who is both strange and supportive, has issued a challenge to the Japanese government: save the Earth from destruction. The teacher wants to lead the class with the lowest expectations for success. Equipped with special weapons that only harm their teacher, the students must find a way to eliminate him before the school year ends. If they fail, the world will end, and summer break will be canceled.
Ansatsu kyôshitsu
Students at Kunugigaoka Junior High School stumble upon a startling revelation when their teacher is exposed as the mastermind behind the sudden and unexplained reduction of the moon's size, leaving it forever crescent-shaped.
