Amemiya is an unpopular Youtuber who specializes in the occult. One day, his manager brings him a home floor plan. His manager tells him that the layout looks like an ordinary home floor plan, but the layout contains an inscrutable point. Amemiya begins to look carefully at the floor plan and Kurihara, who is an architect and a fan of mysteries, joins him. They try to reveal the mystery behind the house. Meanwhile, Yuzuki contacts Amemiya and tells him that she knows something about the house he posted on his YouTube channel. She joins Amemiya and Kurihara to reveal the mystery of the house, but she also seems to have a secret.