After her divorce, Ayano raised her son Hiroaki all on her own. Despite financial hardships, she endured every struggle for the sake of her child's future. Now, Hiroaki has finally come of age and is about to begin his journey as an independent adult. To express his gratitude, he plans a hot spring trip for his mother as a token of thanks. Surrounded by warmth, their emotional bond deepens—until boundaries blur. As affection turns to desire, the two engage in forbidden intimacy, exploring incestuous passion in the secluded inn. Witness the intense, taboo relationship unfold in this Mother-Son Copulation tale from Ruby's Journey label.