Kazuya Kagami wakes up in class from a bad dream to discover that he is inadvertently groping classmate Chisato Chikaishi's breasts. After escaping her wrath, Kazuya goes to the roof where he takes comfort in his late mother's obi. Kazuya is attacked by a possessed wig and falls off the building, but is saved by his obi. From within the obi, a young girl, a tsukumogami, emerges...