kaede minato graduates from university and moves to tokyo for work. she stays with her brother and his wife while looking for an apartment. kaede, who is always horny, dislikes her brother's wife because of her strong erotic aura. this time, her brother is away on a two-week overseas business trip. her sister-in-law, rui negoto, plans to ignite kaede's erotic desires and make her her own sex slave.