One day, Airi is suddenly kidnapped and locked inside a creepy room. There, she meets Shota, a boy who has already been living in the room for twelve years. As the kidnapper's sexual training of Airi becomes an everyday occurrence, a strange accomplice relationship between the two slowly deepens. Amidst despair, the feelings Airi begins to develop for Shota shine like a ray of hope. The path she ultimately chooses—what will it be?