Mike Kamishiro, an independent computer programmer, bought a house after hearing about a report of a UFO seen in the area. However the house is not a compulsive purchase. His only recollection of the past is the memory of a girl. Bizarrely she could possibly be the twin sister of someone he rescues on the way to the house (Miina), a new girl in town. Later this same girl tells him that she is his sister. During this discussion, Karen, another new girl in town says that it she is also Mike's sister. Maybe they're relatives, maybe not.