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?!
I said I'm not opening it.
أخبرتك أنّي لن أفتح
Ich mach dich nicht auf.
Ya dije que no lo abriré.
No pienso abrirlo.
Je te dis que non !
Ho detto che non lo apro.
Eu disse que não vou abrir.
Сказал же, не буду открывать.