Scars of Summer

Your childhood friend Ryouka Enomoto is the ace of the basketball team at your countryside school. Growing up together in such a small rural area, you naturally fell in love with her. However, after you have to move to the city, you can only return to stay with her in the summer. When you come back...

While spending the summer with your childhood friend, she is bedded by other men from under your nose in naturally occurring cucking events. Pervy middle-aged men, vagrants, bullied students, lusty students, loner virgins, delinquents, and more...

You have various ways to find out what she's getting up to.

[From DLSite]