Encore -Summer-

The plot revolves around Yuri, a high school student who has a crush on a classmate, Hideki. They spend time with each other, but it's difficult to call the two little more than acquaintances. Yuri hopes to change this during the summer festival being held in their town. He, however, introduces her to another girl, Mitsu, who Yuri sees as a threat to the relationship she wants to cultivate. While she wants nothing more than to forget the situation, Yuri finds herself being forced to watch her crush fall for Mitsu as he forgets about her.

[From itch.io]