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?!
And where exactly do you 
have them teleporting to?
وأين نقلتهم إذاً؟
Und wohin wollt ihr die Leute teleportieren?
Quindi?
E o que mais?
И что дальше?