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...
One problem involving unraveling 
the mysteries of prime numbers
أحد المشاكل التي تتعلّق بالكشف عن غموض الأعداد الأوليّة
Eine der größten ungelösten
Fragen der Mathematik
Un problema que consta
de revelar sus misterios
Un problema sobre su misterio
Le plus gros problème non élucidé
des mathématiques
Il più grande problema irrisolto 
del mondo della matematica
O problema envolvendo o mistério
dos números primos
Одна из задач, 
касающаяся простых чисел,