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...?!
Let us assume that the glasses case 
weighs the usual approximate 50 grams.
.لنفترض أنّ علبة النظّارات تزن حوالي 50 غرامًا في العادة
Gehen wir davon aus, dass ein
Brillenetui in etwa 50 Gramm wiegt.
Digamos que el estuche pesa
un aproximado de 50 gramos.
Digamos que el estuche pesa,
aproximadamente, 50 gramos.
Supposons que cet étui
Ipotizziamo che la custodia per gli occhiali
pesasse circa 50 grammi.
Vamos assumir que aquele estojo de
óculos tenha cerca de 50 gramas.
Предположим, что обычный футляр 
для очков весит примерно 50 граммов.