Movie Information:
I came to a hot spring inn with my brother and his wife. Seeing my sister-in-law up close on this trip, she looked strangely sexy and made my heart race. While soaking in the famous mixed-gender open-air bath, I got aroused by the sight of her body—which I’d never seen before. Unable to resist, I touched her, and to my surprise, my sister-in-law—who usually seems so serious—was trembling with excitement! A secret sexual encounter that I could never tell my brother about begins…