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Private Bongakuen.
There were nine sons and daughters of prestigious families called Suki (several families) in this school, and they were highly regarded within the school.
There was a battle called "Kazuransen" in several families, and the order order within several families and the head order of several families (Bon) had been regularly determined by this battle since a long time ago.
It had been said that this battle could not be fought again because one number was missing.
However, the condition of the Kazuransen was satisfied because of the' numbers that could not exist' that suddenly appeared before them.
Her name was 0 崎紘.
She tells the beginning and the end.