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One rainy day, a high-spec businessman is helped by an unfamiliar high school girl at the station. He soon learns that she is the best friend of his younger sister. Used to casual affairs, he tries to repay her with kisses and dates, only to be called disgusting. Instead of backing off, he falls obsessively in love and keeps approaching her with blunt affection. She answers with sharp insults that he somehow reads as signs of love.
