Ten years ago, the mother divorced her husband and raised her son alone. Though her son eventually found a job and was expected to live independently, he refused to leave home, staying indoors all day even on holidays, just sleeping. To draw him out, the mother suggests a hot spring trip. But when she asks, "Masaki, don't you have someone you like?" he replies, "I do... right in front of me..." It becomes clear that his inability to become independent stems from his deep, overwhelming love for his mother. In an attempt to comfort him, she agrees to a one-day pact. Within that pact, her son's love reaches deep into her womb.