In the quiet embrace of Minamiaizu's serene hot springs, Kanako faces a bittersweet farewell as her beloved son leaves home. Haunted by solitude and craving connection, she invites him on a tender getaway, where unspoken desires awaken beneath the steamy nights. Their shared warmth kindles a forbidden intimacy, weaving a delicate dance of longing and vulnerability that blurs the lines of love and temptation.