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...?!
Still, to think a kiss was 
something this difficult...
...من كان يعتقد بأنّ قبلة ستكون في غاية الصعوبة
Aber dass ein Kuss etwas
derart Komplexes ist …
Aun así, y pensar que un beso
sería tan difícil.
Aun así, pensar que un beso
sería tan difícil…
Je n’imaginais pas que les baisers
puissent être si compliqués.
Però, pensare che un bacio fosse una cosa tanto difficile...
E pensar que o beijo era
algo tão complicado...
Кто бы мог подумать, 
что поцелуй — это так сложно...