Oshiego Shiyoujo

The main character happens to save a girl from a groper in a train on the way to school where he works.

The girl turns out to be Hina Tsukamoto, a girl in the class that he is in charge of.

From that day, they start going to school together every day. He starts liking her and she deeply fell in love with him.

What kind of future awaits them?

[From Dlsite]