"Fun Fun Factory" by Yoshitomo Watanabe 4 volumes -complete
Michuri eats the 'witch berries' dessert from Fun Fun Factory. She learns from the owner that if 10 boys also eat the 'curse a la mode' within 24 hours they will be cursed and become the servants of the witch who possessed her. The hunt for the possible servants is kinda slow but their characters and powers are amusing. There's also some kind of a shonen-ai going on within the reverse harem. I can imagine this as a kawaii anime like Shugo Chara with magical girl, bishies, nekos, and desserts that made my sweet tooth ache.