Kazuma Miyoshi, a second-year college student who attends a local university, saved a girl's life from a perpetrator of the subway terrorist incident four years ago.
At their farewell, they exchanged names and chatted cheerfuly, deepening their relationship. He felt the possibility that something like this might happen again in the future, but ultimately, he never saw her again.
Of course, he didn't forget about her. He couldn't forget the tragic sight of her, when he risked his life to save her. But he also thought that it would be better for the girl to forget about him and move on in his life.
He eventually forgot about the promise they made to meet again and went on to live a normal teenage life.
He had a girlfriend in high school and they broke up...and before he knew it, he was already a college student.