A distant relative who became Satou's legal guardian after her parents' death. On the surface, she's cheerful and upbeat, but that's masking some serious psychological issues. Her understanding of "love" is completely warped—she's essentially a masochist who welcomes any kind of attention or desire directed at her, no matter how unhealthy. Fans often note that her twisted relationship philosophy is basically why Satou ended up so messed up herself, directly shaping the disturbed worldview that made her into the unhinged person she became.
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