桜塚 薫

A normal Japanese youth who has never had much to do with girls and is sure he'll die a virgin. He has a complex about his effeminate features and his unisex name. He tries to make up for looking like a girl by wearing an extra coating of male bravado wherever he goes. When he's changed into a girl after drinking a strange potion, he learns that his body possesses rare "yin-yang" (dual-sex) DNA.

 and game manual