At a quiet hot spring inn far from civilization, an unexpected tragedy unfolds. The outdoor bath, originally meant as a soothing sanctuary, suddenly becomes a whirlpool of twisted desire. The mixed-gender bathing creates a sense of liberation, and the sight of women's wet skin tempts the men's reason, awakening uncontrollable instincts. Amid the rising steam, in a space from which no one can escape, the men's lust spirals out of control. The situation escalates further into deeper depravity.