A female dog worthy of this room... Marina, a female doctor with beautiful appearance and excellent medical qualities, has led an ideal life without any inconveniences, but for some unreasonable reason, two men who have a grudge against her lock her up in a cage for large dogs in a small, filthy four-and-a-half-tatami room. Her pride and dignity as a human being are torn apart by the men's abhorrent confinement and training, and she is reduced to an ugly, filthy woman, to the point where she even thinks, "I want to become a slave worthy of this cage..."