After seeing a house he recognizes in a news broadcast, orphaned Maiku Kamishiro finds his curiosity about his family aroused. It seems the house is in a photo showing Maiku as a boy playing in a pool with a little girl he assumes is his twin sister. Looking for answers, he locates his childhood home, rents it and then gets the surprise of his life when two teenage girls show up at his door, each claiming to be his twin.