fun fun Factory

Michiru Mochizuki receives a birthday gift from her friend Chiya-chan, which involves a visit to a restaurant called Fun Fun Factory. There, she eats a dessert containing a rare "witch berry," and ten other desserts with "star grapes" are also served. According to the rules, if a girl consumes a witch berry and ten males eat star grapes within 24 hours, a magical effect is triggered. This causes Michiru to be possessed by an evil witch. To stop any potential catastrophe, she must locate all the men who ate the star grapes and discover a way to remove the witch from her body.