In Orario, the only place in the world that hosts the entrance to the
massive subterranean Dungeon, there's a certain tavern where the most desperate
and vulnerable bring their troubles. There, the ex-adventurer Lyu Lion uses her
terrifying strength to wrest what justice she can from the shadows of the
Labyrinth City! But when a girl goes missing and all evidence points toward the
powerful Grand Casino, she may need more than brute force to help...!