Unable to bear his beloved daughter's departure after marriage, a doting father remodels his home so the newlyweds can live alongside him and his wife Momoko. Everyone gets along, including Momoko and their son-in-law Hajime, and the arrangement seems perfectly happy—until Momoko begins finding excuses to visit the young couple's side of the house. Soon she claims to be going out with her daughter when the daughter is still home, and her growing web of suspicious lies points to a secret affair.