Fiancé wa Monster!?

Hitomi Miku moves into a mysterious house and meets Rauto, the young and attractive owner. She soon learns the house is inhabited by monsters. After receiving a special necklace from Rauto, she transforms and defeats a monster possessing a girl. Confusion follows as she becomes his maid and potential fiancée. A separate short story involving a prince and a girl named Hoshino W is also included.