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...?!
Now, the strength of polyvinyl chloride, 
it's rating according to the Charpy impact test,
،والآن، قوّة الكلوريد متعدّد الفينيل
 تصنّف على حسب اختبار تأثير شاربي
Die Stärke von Polyvinylchlorid-Harz nach
Berechnung im Kerbschlagbiegeversuch
El cloruro de polivinilo,
según la prueba de impacto de Charpy,
El cloruro de polivinilo,
según la prueba de impacto de Charpy,
Le PVC a une valeur
de résilience Charpy
Ora, la forza del polivinilcloruro,
secondo la prova del pendolo di Charpy,
O índice de força do policloreto de vinila,
de acordo com o teste de Charpy,
Ударная вязкость поливинилхлорида 
при испытании по Шарпи