Koi no Hanashi

Chihiro, a handsome gay bartender, has never had anyone treat him as their true love. One day, he runs into Ritsu, a high school classmate he once loved, and begins to envy the happiness Ritsu seems to enjoy with his partner. Eventually, Chihiro develops a dark obsession with Ritsu, who often visits his bar...

(Source: Hakusensha, translated)

Note: Includes 1 extra chapter.