Seiichi's father had long subjected the family to domestic violence. One day, when his mother Yukino suffers an especially brutal beating, Seiichi finally strikes back at his father to protect her. Embracing her son who defended her, Yukino resolves to flee the house. With nowhere else to go, the two end up at a remote, run-down hot spring resort. As night deepens and no light of tomorrow appears, they seek mere warmth in each other's arms, their bodies drawing close. In this extreme situation, the pleasure shared between mother and son etches deeply into their souls. In the moment their hearts and bodies become one, they find a new hope.