Madou Senki : Deep Dungeon

About

The town of Dorl has an infestation of demons who currently reside in the castles dungeon after a portal to the underworld was opened. The emperor of the underworld, Emperor Ruu, commanded his demons to raid the town to steal its treasure and during this ransacking the demons also managed to take Princess Etna's soul away too, leaving her in a comatose state. Many brave adventurers have entered the underground dungeon to try and reclaim her soul from this demon king, but none have returned successfully yet. So now it's up to the player to succeed where others have failed and put an end to the Emperor Ruu and also recover Princess Etna's soul.