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 are the personal squad of Leia-sama, 
captain of the demon army's third division!
فرقة ليا-ساما الخاصّة، قائدة الكتيبة
!الثالثة لجيش الشياطين
die Truppe des Anführers
der dritten Dämonenarmee, Leia-sama!
la tropa especial de la señorita Leia,
capitana del 3.° escuadrón demoníaco…
la tropa especial de la señorita Leia,
capitana del 3.° escuadrón demoníaco…
... siamo la squadra personale della grande Leia,
capitano della terza divisione dell'esercito demoniaco!
o esquadrão pessoal de Leia-sama, capitã da
terceira divisão do exército de demônios!
личный отряд госпожи Леи, 
командира третьей дивизии армии демонов!