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...
If you solve it, you receive 
a prize of 1 million dollars.
.إن قمت بحلّها ستحصلين على جائزة بقيمة مليون دولار
Wenn du die löst, bekommst du
ein Preisgeld von einer Million Dollar!
Si la resuelves,
recibirás un millón de dolares.
Dan un millón de dólares
por demostrarla.
C’est une énigme
à un million de dollars.
Per chi lo risolve c'è un premio di un milione di dollari.
Se você resolver, ganha um milhão
de dólares como recompensa.
За её доказательство заплатят 
1 миллион долларов.