The first semester has come to a close, and the Ikeda lab is having a party where everyone's bringing what they like to eat and drink. They're having fun, playing games like the "prime number Yamanote line game," when a drunken Himruo finally does a certain something with Yukimura... And even Kanade ends up drunk... On the other hand, the mood quantifier obtained through the previous round-robin kiss experiment has progressed their research tremendously, and in order to gather more data, Yukimura and the others use fairy tales such as "Snow White," "Kaguya-hime," and "The Crane Returns a Favor" as references, but...
How can you pop out prime numbers like that?
كيف يمكنك معرفة الأعداد الأوليّة بسهولة هكذا؟
Aus welchem Arsch ziehst
du denn die ganzen Primzahlen?
¡¿Cómo sacan
números primos así nada más?!
¿Cómo sacáis
números primos así sin más?
Comment vous faites
pour en sortir autant ?
Come fate a sparare i numeri primi così a raffica?
Como vocês lembram tão rápido
de números primos?!
Как вы так легко называете 
простые числа?