I found out my girlfriend had been cheating on me the whole time right before we got married ~ When I despaired and hit my head against the wall, I time-leaped to before I started dating her ~

My fiancée—Kiryu Tōru was cheating on me. And it wasn't just barely crossing the line. It was so blatantly wrong that there was no way to make excuses anymore. To be specific, the moment she walked out of a hotel with her arm linked with another man's. The detective agency employee I'd hired captured that moment perfectly in a photograph. When I showed her the photo, Tōru admitted to the affair without any hint of remorse, saying "I got caught." On top of that, she even brazenly defended herself. Dammit... why did I ever get engaged to such a woman?! In my despair, I hit my head against the wall and lost consciousness. When I came to, I wasn't in a hospital—but rather at a university drinking party from the days before I started dating Tōru. Now that I know her true nature, this time I'll escape from this wicked woman Tōru and seize happiness...!