Delicate Balance

Two twins arrive in Orario, and they both have a story to be told. Joined by their Goddess, Dia, they will find that the Dungeon City isn't as it's all cracked up to be. Both of them rely heavily on one another, and they must maintain what they have always had. They will still have bumps along the way, as expected when they run into certain Familias. What can possibly go wrong?