Hattori and Yamato go way back—they've been friends since childhood, bonding whenever Yamato would visit his aunt Ayano. Back then, Hattori had a knack for dragging Yamato into trouble, mostly because he saw an opportunity to hang around Ayano's dormitory and its women's bath. He's a self-proclaimed ladies' man obsessed with romance (or, as Yamato puts it, perverted stuff) to the point where it apparently outweighs his appetite. His stated life goal? Dating every woman alive and somehow getting Japan to legalize polygamy.
Yamato often turns to Hattori for relationship advice, though it rarely goes well—mostly because Hattori's guidance tends to backfire spectacularly when paired with Yamato's already questionable judgment. That said, underneath the troublemaking and inappropriate schemes, Hattori genuinely cares about Yamato and usually has his back.
What surprised both Yamato and Miki was discovering that Hattori had maintained straight A's throughout high school—not exactly the personality type you'd expect to be academically flawless.
Hattori and Miki later showed up briefly in Chapter 67 of A Town Where You Live during Haruto's class trip to Tokyo, where they ran into each other.
Content compiled by AnimeList.moe from publicly available sources.
