Satomi, married for six years now. Things were going smoothly with her husband at first, but lately there's been a strain, maybe due to a lull in their relationship. Satomi wants a child soon and is thinking about fixing things, but then she discovers her husband's infidelity. The other woman is apparently his ex-girlfriend, Anna from their college days. A cold and sharp battle between the two women erupts over their indecisive husband. The back-and-forth struggle culminates in a crazy threesome between the loving wife and the ex-girlfriend...