So Hibiki is both a huge superfan of Ai and as of recently, part of her new music-based unit, so I'd like to imagine that they could have a mildly pre-baked CR in being friends, whether just by virtue of peppy personalities being drawn to each other or mutual superfan bonding. That said, Hibiki definitely isn't at a point where she knows much of anything about Ai's homelife, which means that unless anybody outright tells her, she's not gonna know about Ruby's relation to Ai outside of "fellow Ai groupie".
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So Hibiki is both a huge superfan of Ai and as of recently, part of her new music-based unit, so I'd like to imagine that they could have a mildly pre-baked CR in being friends, whether just by virtue of peppy personalities being drawn to each other or mutual superfan bonding. That said, Hibiki definitely isn't at a point where she knows much of anything about Ai's homelife, which means that unless anybody outright tells her, she's not gonna know about Ruby's relation to Ai outside of "fellow Ai groupie".