Ishikawa Yuzuki
Yuzuki is your typical girl-next-door type with a twist: she has a massive crush on her older brother Hayato, who attends to her every whim and spoils her rotten. Though she may deny it, she can't seem to stop herself whenever her "onii-chan" is around.
Nanajuu
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Will have special dynamics if she is put into a class with Ishikawa Hayato (https://db.bepis.io/aa2/view/53663).