Reika lost her husband and has been living with her son Nao. However, when her boyfriend Naoto becomes an adult, she decides to remarry in order to start her second life. On the other hand, Naoto cannot accept his girlfriend's mother's sudden remarriage and rebels against it... One day, Naoto accidentally witnesses his girlfriend's mother being creampied by her new father. Naoto can't help but hold his breath when he sees Reika's expression of ecstasy.