Kanojo no Kankei

The main character, Fumito Aida, who works part-time at a family restaurant, meets a college student, Yuma Asahina, who has joined the restaurant as a junior employee.

Fumito is not used to socializing with girls, but he is gradually attracted to her bright, energetic, and friendly personality and begins to like her.

However, Yuma is a girl who is out of his league. He has been thinking of confessing his feelings to her, but has been unable to do so.

One day, he sees Yuma riding in a man's car.

[From official site]