Neat freak university student Minato and her stepbrother Tōru have an extremely tumultuous relationship. Thanks to his handsome looks and notorious playboy habits, Minato has been the subject of bullying from jealous girls for years. But one day, her life is turned upside down when an unrecognisable Minato accidentally bumps into Tōru while wearing a wig, high school uniform and gaudy makeup. In a moment of flustered panic, Minato pretends to be a high school student named Mina, and Tōru falls in love at first sight. When he proves to be more than determined to start dating ‘Mina’, Minato decides to go along with the lie to get sweet revenge against her stepbrother.