Ibarada suggests that one of the greatest factors in the base conditions of romantic love is "whether or not you want to kiss the person," so Yukimura decides to try to kiss Himuro. However, Himuro doesn't like the idea of a kiss where the exact angle is measured with a protractor.  When Himuro realizes that if the mood were more like it had been in the Ferris wheel, she might not mind a kiss, she and Yukimura create an equation to numerically define "mood value." In what location might the "mood value" be highest? And will the two of them be able to kiss...?!
When people are in the dark, 
they start feeling naughty—
،عندما يتواجد الناس في الظلمة
 —يبدؤون في التصرّف بشقاوة
Wenn das Licht erlischt,
dann ist die Stunde des Unterlei…
La gente se siente traviesa
por la noche.
La gente está más traviesa
por la noche.
Être dans le noir excite les gens,
c’est connu.
Quando le persone sono al buio,
iniziano ad avere pensieri spor—
No escuro, as pessoas
ficam mais desinibidas—
В темноте люди начинают 
вести себя непристойно...