For some reason, the glasses case Himuro gives Yukimura as a present is smashed to pieces. Shock sends Himuro racing away from the scene. Ibarada points out that it could have broken when Himuro fell on the stairs, but Yukimura estimates the force of impact based on the case's mass, materials, and height of fall, and concludes that someone must have deliberately destroyed it. Finally, at dawn, Yukimura finds Himuro crouched alone, barefooted, on a bridge. Will they be able to reconcile? And will they be able to prove their love...?!
This is all to understand the 
general conditions of "love."
."كلّ هذا من أجل فهم الشروط العامّة "للحبّ
Es geht hier darum, die Grundbedingungen
für Liebe zu verstehen.
Era para entender
las condiciones del amor.
Era para entender
las condiciones del amor.
Je fais ça pour trouver
les conditions de l’amour !
Tutto questo serve a capire quali siano
le condizioni generali dell'"amore".
É para entender as condições
gerais do que é "amar".
Всё для того, что понять 
общие свойства «любви».