My Brother is his Ex-Boyfriend

To please his crush, Kunishige Yuu, an ordinary middle schooler, stole his brother’s invitation to a photography exhibition. However, he never would have thought he’d encounter an intimidating long-haired guy at the very place, who seemed to be his brother’s acquaintance… or even more than that, his brother’s ex-boyfriend…?

(Source: Shinshokan, translated)

Note: Chapter count includes 2 extras