

In the second part of the series after the first time skip, Saki learns that
she did have a sister called Yoshimi. According to the comments made by her
mother, Yoshimi was killed by an Impure Cat.

Yoshimi showed signs of having gained her powers early but didn't seem
controlled because of how her name looked in the mirror Saki found.
Considering that she didn't look all that much older to Saki,

  * Was Yoshimi really that much of a threat to have developed her powers so early that she had to die?

  * Isn't the purpose of the Unified Class to help children and teenagers control their powers? 

  * Why couldn't Yoshimi just be a child prodigy who could one day take Shisei Kaburagi place? 


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2015-10-18T22:02:40.633
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2023-06-24T17:09:11.067
2016-01-13T04:12:46.987
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from-the-new-world
Why was Yoshimi killed?


I wondered the same thing. Is it possible that perhaps she never graduated
elementary?

Saki's mother was very excited when Saki's spirit came to her finally.
Throwing herself into her, it could be from feeling another failure for her
last chance as a mother.

Or perhaps she moved up quickly but then became stuck in a rut like Shun.
Maybe she was a student much like their 5th partner who didn't last long.

Her inability to gain any traction on her powers may have been looked down on.
Maybe it depressed her sister and had an opportunity to bring rise to a demon.
Perhaps the child seemed too problematic and posed a threat to become the next
demon.


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2016-01-12T10:44:17.557
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There's an answer in the book. She had an eyesight problem (astigmatism +
short-sightedness) that was misinterpreted as a defect of her cantus. Her
eyesight problem is the reason her name in the mirror looked the way it did.


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2021-08-02T22:13:27.293
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In the anime, any child who wasn't able to consciously control their abilities
was considered a threat because their unconscious mind might accidentally
create a dangerous situation for the entire community. For example, warping
reality as an instinctive defence mechanism, or killing someone who might
threaten them even if the child didn't want it to happen.

There were other factors in the books, but these may not be canon to the
anime.


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2021-09-02T07:15:27.647
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