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...?!
That's a lovely smile 
and a horrible comment!
!يا لها من ابتسامة جميلة وتعليق فظيع
Ein süßes Lächeln zu
einem gemeinen Kommentar.
¡Bonita sonrisa, pero qué cruel!
Bonita sonrisa, pero qué cruel.
Ça a l’air de te rendre heureuse !
È un sorriso adorabile con un commento orribile!
Um sorriso tão belo
e uma frase tão fria!
Ужасные слова с прекрасной улыбкой!