Ginkgo and Camouflage

The male protagonist met the female protagonist who was also a freshman in college. The male protagonist liked the female protagonist and the female protagonist also liked the male protagonist. The two went through a lot and got together with the male protagonist, but it did not end well in the end. After the two broke up, the male protagonist joined the army and had no contact with the female protagonist. However, the female protagonist did not get together with anyone again. Until many years later, the male protagonist saw the female protagonist again in a corner of the city. He walked towards her and greeted her like he did in school back then.