Sei Sou Tsui Dan Sha

The story of Ogawa Ryuu, a shy young man who is frequently bullied by three girls. During one especially violent bullying session, an extraordinary and supernatural event occurs, dramatically altering the dynamic between the girls and Ryuu. The girls discover that Ryuu's anatomy has transformed into a living sex toy. They attach it to various objects, including themselves, leading to explicit and unconventional scenarios. They engage in intimate acts with each other, friends, strangers, and even Ryuu himself! However, this newfound power comes at a hidden cost—the girls start noticing changes in their own personalities, unleashing their deepest and darkest desires. As the story unfolds, the girls must confront the consequences of their actions and the transformations they undergo.