She comes from the prestigious Kuonji family—her father was the elder son, and her mother was a witch he fell in love with. Growing up in a mansion by herself, she's naturally gifted at witchcraft, though emotionally she's pretty closed off. She's self-destructive in her own ways and doesn't let people in easily, which kept her isolated for a long time.
That changed when Aoko came into her life. Over more than a decade of knowing the Aozaki family, she's gradually warmed up to Aoko and now considers her a genuine friend. These days she serves as Aoko's mentor and partner, passing on what she knows about witchcraft. Fans often note how meaningful this relationship is to her character—it's one of the few genuine connections she's allowed herself to have.
Content compiled by AnimeList.moe from publicly available sources.