Karen and her husband Hiroshi have to borrow the bath of the Kaneda family who live next door for a while after their bath breaks down. Mikio, the eldest son of the Kaneda family, has always admired Karen, but when he sees Karen defenseless after a bath, he starts to have more and more nasty fantasies... One day, Karen is peeking at Karen while she is taking a bath, but she finds him. Mikio prepares himself for a scolding, but Karen says something unexpected...