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Private Bon Gakuen.
There were sons and daughters of nine famous families called several families in this school, and it was an existence to be respected in the school.
There was a battle called "Battles of Numbers" in several families, and the headman "Bon" who controlled the order in the number family and several families was regularly decided by this battle from long ago.
However, it has been said that this battle cannot be fought again because of the lack of one number.
However, the condition of the battle of numbers can be satisfied because of the "number that should not exist" that suddenly appeared before them.
Her name is Hiroka 0 saki.
She tells the beginning and the end.