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...
was one that even the most 
brilliant couldn't solve.
.كانت معادلة لم يستطع أكثر العلماء ذكاءً حلّها
war eines, das selbst die klügsten
Köpfe nicht zu lösen vermochten.
fue uno que ni las mejores mentes
podían resolver.
fue uno que ni las mejores mentes
podían resolver.
laissé par la princesse
et Pierre de Fermat.
il problema lasciato da Kaguya-hime e Pierre de Fermat.
nem os mais inteligentes
conseguiam resolver.
не могли доказать даже величайшие умы.