Sachi is a third-year high school student who comes across as reserved and bookish—you'll typically spot her with her nose in a book and her glasses on. She's deeply attached to Touko and pretty protective of her, which makes sense given how close they are. She's apparently aware that Yukinari has feelings for Touko, so when she first meets Kakeru, she's immediately suspicious of him and his dynamic with Touko. It doesn't help that his interest in her seems a bit unclear to Sachi at first.
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