Fun Fun Factory

Michiru Mochizuki was a normal high school girl until a birthday present from her friend changed everything. Michiru's friend, Chiya-chan, took her to a famous little restaurant known as Fun Fun Factory, and there she was served a dessert from their special menu. It turns out her dessert contained a one of a kind "witch berry" and the other special menu desserts served that day contained 10 special "star grapes". When a girl eats a witch berry, and within the next 24 hours, ten males eat star grapes, a magic spell takes effect - and the conditions have been fulfilled. Now Michiru is possessed by an evil witch! To prevent disaster, she must find all of the males who ate the star grapes and figure out a way to make the witch disappear.

(Source: Anime News Network)

Note: Includes 2 extra chapters and the one-shot “Medicine Wheel.”