After rescuing Horn, Diablo learns of Horn`s secret. Meanwhile, Shera, Rem, and Lumachina make progress through the dungeon and reach the twelfth underground floor.
When Rem opens the door, they find the man pursuing Lumachina - Gewalt. To make things worse, a Large Black Dragon appears with a terrifying blast of wind!
Second season of Isekai Maou to Shoukan Shoujo no Dorei Majutsu.