Mei, a neat and clean office lady, has moved to a new town. The place she moved to is an apartment with a collapsed morals, inhabited by old men who live in trashy rooms. When she tries to talk to them about whether they are bothering the neighbors, the old men get angry and forcibly devour her body. Unable to escape, Mei is tormented in the filthy rooms of the apartment, and in the end, she is completely immersed in the swamp of sexual pleasure, refusing to resist the foul smell and the dirty room, and becomes the old men's sex slave...