The girl Shiki met in the library was the same girl that he had seen riding on the back of Sasajima's bike. The book she left behind has a marker stuck to the page on building quiz bowl buzzer systems. Is she involved with quiz bowl? As Shiki is thinking about all his, Mari tells him they're having a joint quiz bowl practice with another school today. That school turns out to be Miyaura High, the team that claims Mikuriya as a member!
Which means subtracting or dividing would 
be unnatural, so maybe multiplying?
ممّا يعني أنّ القسمة أو الطّرح سيكونان
غير طبيعيّين، فهل السّؤال عن الجداء؟
Subtraktion und Division wären seltsam,
also vielleicht die Mulitplikation?
Restar o dividir sería raro,
¿será multiplicar?
Restar o dividir sería raro.
¿Será multiplicar?
Donc il faut soit soustraire,
soit diviser… ou bien multiplier ?
Quindi, visto che sottrarre o dividere
sarebbe innaturale, bisognerà moltiplicare?
Subtrair ou dividir não é natural,
 então talvez seja multiplicação?
Вычитать или делить было бы нелогично,
остаётся умножение?