Uwakizuma: Hamerareta binyû (2006)

Yuji, a university professor, married Reiko, the dean's daughter, in order to become an associate professor. However, he secretly continued an affair with Mai, his research assistant. While Yuji was enjoying his affair with Mai, Reiko was also secretly meeting with Shingo, her first love whom she had reconnected with at a class reunion. On her way home, Reiko, driving alone, hit a man who suddenly jumped in front of her car...