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?!
So it can even transfer my 
opponent's strength into my own?
يمكنها نقل قوّة خصمي لقوّتي إذاً؟
può persino trasferire la forza
del mio nemico dentro di me?
Então isto pode transferir a
força do oponente para mim?
Значит, она может передать 
силу противника мне?