Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria, Vol. 15 (manga) — Fujino Omori

While walking along Daedalus Street, Gareth comes upon a staircase leading to an underground labyrinth, and it just may be the dungeon Loki Familia has been looking for! With orichalcum doors and adamantine walls, this subterranean fortress isn't going to be an easy one to infiltrate. As Loki's forces split up to cover more ground, Finn's party finds themselves facing a familiar foe, one with vengeance on the mind...