While looking for a place to live alone, Gaku stays with his brother and sister-in-law. Although he wanted to find an apartment quickly, he was attracted to his sister-in-law, Kanako. One day, after returning from searching for an apartment, Gaku saw Kanako cleaning the bath and lost control. He flipped up her skirt and thrust his penis into her, ravaging her like a beast from behind. The intense pistoning, the act of being taken from behind, made Kanako resist while experiencing unprecedented orgasms repeatedly…
