Saenai Oji-san to Ore-sama Yankee-kun

Subaru, a man with a quick temper, encounters a seemingly unremarkable older man who is in a difficult situation. He intervenes to help, and the older man, who is about twenty years his senior, thanks him with a smile. This simple interaction leaves Subaru unexpectedly captivated. Despite their brief meeting and subsequent separation, he finds himself unable to stop thinking about the man. He begins to question whether this sudden infatuation is real or something else entirely.