Yuika's a first-year student who works as an assistant librarian alongside Keiki. She's got blonde hair and blue eyes—part of her mixed heritage on her mother's side—and comes across as pretty shy and distant at first. But Keiki's persistence eventually gets through to her, and she loosens up.
Here's the thing though: beneath that reserved exterior, Yuika's got a sadistic streak and harbors some pretty twisted fantasies about making Keiki her slave. She figured out Sayuki's whole fetish situation the moment they first met, and since then she's taken it upon herself to "protect" Keiki from what she calls the "Witch's" influence—which is less about genuine concern and more about removing the competition for Keiki's attention. Fans often note the darkly comedic tension this creates, since Yuika's self-appointed protector role masks her own less-than-noble intentions.
Content compiled by AnimeList.moe from publicly available sources.
