Hiroshi unexpectedly decided to get married when his girlfriend became pregnant. They are now officially married, and her mother lives alone in the family home. With the birth of their child approaching, Hiroshi frequently visits his girlfriend’s mother for support and stops by the house regularly after hospital visits. Due to his pregnant girlfriend’s condition, Hiroshi is forced into a life of abstinence, and he gradually finds himself overwhelmed by uncontrollable desire for his girlfriend’s mother, whose mature body stirs his deepest urges under the same roof.