Chiaki Niimura, 34 years old. After a six-year romance, she married her partner, and including their cohabitation period, they've shared a 14-year relationship. But over time, they've grown so accustomed to each other that they've become like air—present but unnoticed. Adding to her emotional turmoil are the frequent moans she hears from her mother-in-law late at night. Despite nearing her sixties, her stepmother-in-law continues to passionately enjoy her sexuality. Embarrassed and unable to face her husband, Chiaki has essentially given up on intimacy at home. It was perhaps inevitable, then, that she began seeking pleasure elsewhere. Recently, she's been maintaining five or six "convenient boyfriends" she met through dating sites.