Natsumi is Hina's childhood friend from those summers when Hina would visit her grandfather. They'd hang out back then, though Hina didn't even recognize her at first when they reconnected. Still, having someone familiar around made a huge difference in keeping Hina involved with the club.
On the surface, Natsumi reads as just another tomboy type, but there's more to her than that. She's actually a solid student—which surprised Hina—and genuinely supportive of Hina getting into fishing. She's been pretty key to encouraging Hina's growth as a fan of the hobby.
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