Beautiful high school girl named Satou Matsuzaka believes she has finally found the meaning of love when she begins living with a younger girl. Previously, Satou never refused the advances of any guy around her, but that changes when she meets the girl Shio. The background and age of the mysterious girl are unclear. When Satou is with Shio, she experiences a very sweet feeling, which she understands as love. In order to protect that feeling, Satou is willing to do anything, even if it means committing murder.