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Cousin? Wasn't it sister?
In that episode she appeared in Biribiri-form I'm pretty sure she called out "Onii-chan!" to him and didn't he go like "Why is Biribiri taking up an imouto-chara?!" ?
Either way that's the only or one of the only times she appears (dunno about Light Novel) and you only take a glimpse of her real look in that mobile phone.
Since there's no blood relation at any rate and Toma lost his memories I don't think there's much to say about their relation to one another.
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