Iroha's a first-year high school student and the younger sister of Akiteru's best friend, though her attachment to Akiteru himself is. well, weird—she's pretty clingy around him in a way that doesn't quite match the usual friend-of-the-family dynamic.
She's got the honor student thing down: bright, kind, and genuinely good-looking. The problem is she gets excited way too easily and has basically no read on social situations. She does things at her own pace without really checking in with what's actually happening around her, which can be awkward or funny depending on the moment.
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