Natsuki Tono comes to a hot spring resort with her current fiancé. The inn's maid at their destination looks exactly like her former lover. When she asks for the maid's name, a shocking truth is revealed—this person is the son she gave up for adoption 22 years ago. Overwhelmed by shock and confusion, she initially leaves the inn with her fiancé, but decides to stay behind for one more night. As her son washes her back and their skin touches, memories of her past lover merge with the warmth of her son's body, tightening her chest with emotion. These feelings soon transform into an unbearable physical desire. Forbidden love and emotional conflict begin to bloom here and now.