On a weekend getaway to enjoy a rare day off, Kenichi heads out on a hot spring trip. Usually caught up in a busy routine, this time he wants to cherish family time, so he sets off on the journey with his wife. What catches his eye is his mother-in-law, Nobuko, going about with her usual gentle smile. From the moment he learns she'll be joining them, Kenichi's heart begins to race. At the outdoor hot spring bath, Nobuko stands quietly in a yukata, her elegant figure subtly concealed yet radiating quiet allure. Her hidden sensuality beneath the garment stirs uncontrollable desire within Kenichi, awakening urges he can no longer suppress. By the end of this trip, his inner turmoil will come to light.