Seiichi and Saria train under Artoria to become adventurers. During their training the three of them are teleported into a dungeon by a demon’s trap.

The dungeon they find themselves in the stronghold of the Black Dragon God, the strongest member of the Demon Lord’s Army. Artoria gets separated from Seiichi and Saria in the dungeon and the giant Black Dragon God appears before her. Then that overwhelming threat attacks! Can Seiichi and Saria save her in time?!
We should catch at least one 
human after setting up that many!
يُفترض أن نمسك ببشريّ واحد
!على الأقل بعد نصب ذاك العدد
Mit so vielen sollte doch
jemand darauf reinfallen.
Con todas las que pusimos,
al menos uno habrá de caer.
Con todas las que pusimos,
al menos debería caer uno.
Avec des pièges pareils, y en a
forcément qui tomberont dedans.
Almeno un essere umano ci cascherà,
dopo averne piazzate così tante!
Devemos pegar pelo menos um
humano com tantas armadilhas.
Мы столько понаставили, так что 
хотя бы одного должны поймать!