Not the Girl, Not Her (2021)

Original title: じゃない方の彼女

Masaya Kotani is an associate professor at a university who has led an unremarkable life. One day, however, he has a series of chance encounters with Reiko Nonoyama, a woman who attends the university where Masaya works, and they become interested in each other. They say a miracle happens when coincidences happen three times in a row. Masaya tries to keep his distance from Reiko, but is drawn in by her natural charm, and falls deeper and deeper into the swamp of love…