Datenshi Koumori-kun no Junai

A first-year high school student named Riku Shiraha reconnects with her childhood friend Koumori-kun after a six-year separation. She is drawn to his "bad boy" image in a way she does not fully understand. The story explores their relationship as they navigate the changes between them, with Koumori-kun having shifted from an angelic presence in her past to someone more complex and enigmatic.