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High school freshman Y?ta Togashi was once a "ch?niby? patient" i.e. an overly self-conscious middle schooler. He wants to bury this embarrassing past and begins a new life in high school—unsuccessfully. His classmate Rikka Takanashi, a "current" ch?niby? patient, has found traces of residual symptoms on him and used the fact to force Togashi "making a contract" with her.