Nanako and Hiroyuki, raised in a single-parent household, shared an intensely deep and special bond. After graduating college, Hiroyuki secured a job in Tokyo—not just for career advancement, but to gain the strength needed to protect his mother. On the day of his move, Nanako surprised him with a hot spring trip to celebrate his new job. Their destination: Tateyama, a place filled with cherished memories. From the moment they arrived at the inn, tension simmered between them, soon erupting into uncontrollable passion. As night deepened and the hour of farewell drew near, their connection grew even stronger—culminating in acts of incest, cowgirl position, and cunnilingus that sealed their forbidden love.