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!
That's all there is in this 
world we build together.
هذا كلّ ما هنالك في هذا العالم 
.الّذي بنيناه معًا
Daraus besteht die Welt,
die wir uns aufgebaut haben.
De eso se trata el mundo
que construimos juntos.
De eso se trata el mundo
que construimos juntos.
Un monde qu’on construit ensemble
et qui n’existe que pour ça…
Questo è tutto ciò che c'è
nel mondo che abbiamo costruito insieme.
Esse é o mundo que construímos juntos.
Это единственное, 
что важно в построенном нами мире.