◆Chikako, a married woman whose beauty is beyond her 48 years. With over a decade of no sex with her husband, she dons a bondage outfit and seeks new pleasure as a sex slave.◆Narumi, 44, who married her husband as a 20-year-old virgin. This plump-bodied housewife begins to crave a different kind of sex.◆Mizuho, 46, whose son has graduated from college and left home, leaving her alone with her husband for the first time in 22 years. Yet their relationship has lost its spark. Wanting to feel the old excitement again and refusing to let their bond wither, she begins searching for a new challenge.