Bored housewife Sawa's quietly suffocating life is turned upside down by an accident that introduces her to the world of adultery.

Sawa tries to discourage her growing attraction to Yuichiro, while Rikako actively encourages it.

Sawa unknowingly befriends Yuichiro's wife; Sawa's husband has caught the eye of his co-worker.

A wife in a sexless marriage is seduced.

Sawa and Yuichiro finally give in to their desires; Rikako is held hostage by her obsessive ex.

Rikako's husband discovers her affair; Sawa realizes a disturbing truth about Yuichiro's wife.