One day, I came home to find my wife, Akari, having sex with a stranger. At that moment, I... Why did it end up like this? There were many turning points. If only I had prioritized my promise to Akari over my old friend, if only I had apologized properly, if only I hadn't canceled the repayment plan at the last minute, if only I hadn't tried to forcefully have sex with Akari, and if only I had stopped Akari and the man from having sex at that time. If only I hadn't made even one mistake, we could have had a happy ending...