Yuzuki's twin brother who got her into WIXOSS in the first place—he's the one who handed her that deck with Hanayo in it. Kazuki's actually one of the rare people outside the Selector circle who knows what's really going on with the game, which puts him in an interesting position. Fans often note that he's oddly oblivious to his sister's romantic feelings, despite being close enough to her that he introduced her to the whole thing.
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