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The story takes place on a faraway planet, called "Chuu-Gakusei," where everything is in monochrome. The story follows Tanaka Satou, a junior high school teacher. All his students share the same name of Hiroshi Abe. Both the teacher and students wear a white, skin-tight garment that covers the entire body, including hands, feet and face.A new character, Black Teacher, is introduced and reveals the existence of the Kuro Chuu-Gakusei, an all-black version of the planet.