Greedy Wives (2002)

Sayaka has been married to Shuji for seven years. One day, she happens to meet Takashi, who she dated before they were married. Since then, Sayaka has visited him almost every day. That day, while they were having sex, his wife comes to clean the room. Sayaka takes the opportunity to leave the room. The next day, she calls Naomi, a friend from her school days, and confesses about her sexless relationship with Shuji and her affair with Takashi. Sayaka's heart is shaken, and she unconsciously heads to Takashi's room.