Birthday works as a PI for Hamatora out of Yokohama, partnered with Ratio. He's best known for his laid-back, somewhat detached demeanor—the kind of guy who seems unbothered by pretty much everything. When he's not on a case, he picks up handyman work around the city, which honestly fits his easygoing vibe pretty well. Fans often note that despite his aloof attitude, he and Ratio make a surprisingly solid team, even if they seem like an unlikely pair on the surface.
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