Azusa Zenaki transfers to Fukaura High School, a notorious school in town, and meets a ghost boy who calls himself "Yurei-san" in the student guidance room, which is unused by anyone. No matter how much she ignored him, the ghost persisted in asking her to play with him, and she had no choice but to tell him, "If we play a game and win, I'll ask the ghost to leave. If he loses, he must do one thing the ghost says. It was supposed to be a trivial "betting game," but Azusayo's school life changes drastically. A thrilling friendship between a ghost and a delinquent begins in this school fantasy!