Capriccio. My Fave!

Mitsu Hikawa, a second-year high school student, and her best friend Rui Majima secretly love BL, and Mitsu spends her days fantasizing about the boys in her class. One day, one of the people she is observing, Shou Kagomiya, asks Mitsu, "Hikawa, you like Rui Majima don't you?" and Mitsu is shocked――!? A chaotic love triangle (?) between a fujoshi gyaru and a handsome himedanshi!! (Source: Kadokawa, translated)