Yuri is a high school student with a crush on her classmate, Hideki. While they do spend time together, she's not sure if the two of them are more than acquaintances. Yuri hopes to change this during the upcoming summer festival. Hideki, however, introduces her to another girl, Mitsu, who he obviously has feelings for.

Yuri sees Mitsu as a threat to the relationship she hopes to cultivate. She wants nothing more than to forget that Mitsu exists. Yuri finds herself watching helplessly as her crush forgets about her and falls for Mitsu, instead.