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...?!
In order to kiss, the right mood is necessary!
!من أجل التقبيل، المزاج المناسب ضروريّ
Um sich zu küssen,
bedarf es der richtigen Stimmung!
Para besarse se necesita
el ambiente correcto.
Para besarse se necesita
el ambiente adecuado.
Pour réussir un baiser,
l’atmosphère doit être propice.
Per baciarsi è necessario
 che ci sia l'atmosfera giusta!
Para um beijo, o clima é importante!
Для поцелуя необходима 
подходящая атмосфера!