Even though their son Kenji has grown up, Toru and Honami are still close and have sex almost every day. But this active couple is in trouble when Kenji comes home for school holidays. As parents, it's a happy thing, but it's confusing for the couple, who have been getting cozy with each other day and night. Toru is especially unbearable in his later years and in heat. Even if they try to get their son to go out, his parents are lazy and won't budge. Unable to bear it any longer, Toru takes Honami to a love hotel.