He's basically been a fixture at Karasuno's volleyball matches for years. The guy's genuinely invested in the team—he'll cheer loudly when he sees a good play and isn't shy about booing when things fall apart. The current third-year players remember him showing up back when they were first years, and apparently he was one of the people calling the team the "fallen crows" back then, when things weren't going so well for Karasuno.
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