"I'm going to start living with an elf!" Oribe Eiichi, a young man without a job and at the bottom of his life, picks up a mysterious stone in the park one day. When he opens his eyes, he finds himself on top of a giant tree with a beautiful elf in his arms! Eichi tries to save her, but he falls from the tree and loses consciousness. When he wakes up in the hospital a short time later, he finds Kurokawa, who claims to be a public security officer, and the elf Tia. There he learns a shocking truth...