After losing her husband, Yurina lives alone with her stepson. She senses that he views her as a woman, and an unusual tension lingers between them. One day, they decide to take a hot spring trip together. During their journey, her son confesses his love. As Yurina heads to the bath, she is unexpectedly kissed. Though initially conflicted, she gradually succumbs to pleasure and gives her body to him. In truth, Yurina has also been in love with her son. A shocking onsen getaway where emotions beyond familial bonds intertwine with forbidden ecstasy. Experience this deeply erotic tale of mother and son copulation, a taboo journey of incestuous desire.