In "EX-SCHOOLMATE Embarrasses her FRIEND," a former schoolmate returns to town and rekindles a friendship with the protagonist. However, during a gathering, the ex-schoolmate reveals embarrassing secrets from their school days, putting the protagonist in a difficult position. 

As the tension escalates, the protagonist grapples with feelings of betrayal and humiliation. The story highlights themes of friendship, jealousy, and the struggle to move on from the past, ultimately leading to a confrontation that tests their bond and forces them to confront unresolved issues.