A married woman named Rina has been struggling to connect with her introverted stepson Haruki since their marriage. However, when they go on a hot spring trip arranged by her husband, they finally begin to bond. But unbeknownst to Rina, Haruki harbors secret desires for her and can no longer contain himself during one intimate moment. As he passionately caresses her body, she experiences intense pleasure that awakens forgotten sensations within her. Unknowingly seeking out his hardness, she finds herself craving more of this unexpectedly compatible sexual encounter - something she never felt with her husband before.
