Karin
She's been tight with Aoi and Akane since they were kids—basically grew up together. The thing is, she gets both of them in a way nobody else really does. She's always had Akane's back, but with Aoi it's different. Fans have noticed the chemistry building between her and Aoi over time, and eventually Karin actually confesses how she feels. They end up dating after that.
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