The neighbor of the apartment where Mei spends happy days with her engaged boyfriend was a pervert who masturbates while eavesdropping on Mei's exchanges through the wall. Mei is a bit of a clumsy girl who accidentally wears her boyfriend's shirt thinking it's hers. Her neighbor Saeyama, who noticed her there, deliberately sent her luggage and threatened Mei, who used it without permission, to take responsibility for her. Mei, who felt unsatisfied with her at night with her boyfriend, remembered her pleasure in Saeyama's forced sex.
