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?!
To shave the human realm's 
forces down a little more!
!لتقليص قوّات العالم البشريّ ولو قليلاً
Um die Kampfkraft der
Menschenwelt zu schwächen!
Para mermar un poco
las fuerzas de los humanos.
Para mermar un poco
las fuerzas de los humanos.
Pour réduire au maximum
les forces armées humaines !
Per ridurre almeno un pochino
le forze del regno degli umani!
Para reduzir ainda mais as
forças do mundo dos humanos!
Чтобы хоть немного ослабить 
мощь измерения людей!