Yukiko Ihara, 55, has been in a loveless marriage since discovering her husband's second affair ten years ago. She continues enduring the sham relationship for the sake of her children and beloved grandchildren, though she plans to divorce in the future. The thought of her children marrying and leaving home fills her with unbearable loneliness. To prepare for life after divorce, she maintains a relationship with a boyfriend her age. Her mature, voluptuous body sinks deeply into moments of lewd pleasure, intoxicated by sensual delight.