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Michiru Mochizuki visits a restaurant with her friend Chiya Takekawa to celebrate her birthday. After she eats a special dessert, a song from the owner makes cakes rain from the sky. The dessert contained a witch berry, leaving Michiru cursed and possessed by a witch. Ten boys who ate star grapes tied to the berry are also cursed when they come into contact with her. Her birthday outing turns into a supernatural comedy built around sweets, magic, and accidental trouble.