The neighbor of the apartment where Mei lives happily with her engaged boyfriend is a pervert who masturbates while eavesdropping on Mei's conversations through the wall. Mei is a bit of a clumsy girl who accidentally wears her boyfriend's shirt thinking it's her own. Her neighbor Saeyama, who noticed this, purposely sends her luggage and threatens Mei, who used it for her own purposes, to take responsibility for her. he