Kafuka Fuura is cheerily walking to school one April morning when she spots a man trying to hang himself. Kafuka manages to use her weight to snap the rope, saving his life but almost killing him. Kafuka is an optimist while the man, Nozomu Itoshiki, is a pessimist. Kafuka gives him the nickname Pink Supervisor, and proceeds to pay him fifty yen to call him by this name. Nozomu eventually cannot take anymore of the girl's ramblings, and runs off to his school at the start of a new school year. When Nozomu walks in, he finds Kafuka is one of his students.