“The Fight App will make you stronger!” Naoki Mizushima, a first-year high school student, is used as a human practice dummy for wrestling moves by his classmate Tsukamoto. Day after day, he suffers bullying with no way to fight back. One day, a mysterious smartphone app appears before him: “The Fight App.” The rules are simple: Land a hit → Earn points. Spend points → Unlock combat skills. It sounds shady… but with nothing to lose, Naoki installs it. And then—it actually works. With real combat power at his fingertips, can Naoki finally take control of his life and stand up for himself? Or will the app drag him into even deeper battles?