At first, Suzu's married life was happy—her husband was kind and attentive. But over time, their bond grew distant. Hoping to rekindle their relationship, she suggests a hot spring trip. Yet her husband, consumed by work, ignores her completely, leaving her alone and heartbroken during the journey. In her loneliness, she meets a man named Koyama by chance, and their brief interactions stir emotions she thought long gone. Drawn closer together, their bodies begin to move instinctively. Realizing she no longer wishes to return to her marriage, Suzu surrenders herself to Koyama's warmth. Though guilt lingers deep inside, her body quietly heats up, awakening new desires she can no longer suppress.