Adult PC Game: Denshanai de Now by Waffle jap Archive

Now in the series "nau."
Morning train on the way to school. Our hero, Ishido Ryuhei, beats the bully who was pawing the girl with might and main.
That evening, a man appears in front of Ryuhei, accompanied by that bully. Calling himself a master-mover, he sees in Ryuhei a capable master-mover and challenges him to a competition that will show who is stronger.
And if Ryuhei refuses, hooligans will persecute him 24 hours a day and every day.
The hero reluctantly agrees.
The spirit of male rivalry flares up - the bother of the bailiffs begins, now.

Denshanai de Now by Waffle jap Gameplay Preview