Ojalai (O-HULL-EYE) Diabolica is Rita's laid-back and sarcastic daughter, as well as one of Rita's closest confidants. She's always willing to lend an ear and give practical advice to Lubelle. Ojalai may be the older sister compared to Lubelle, but for a demon, she's relatively young at only a mere 400 years old. Being so young, Ojalai can actually recall her first memories.

She spawned amidst a war. Ojalai took up arms in a coalition against an imperial force in a war seemingly forgotten by history. Her strength and cunning proved to be too much for the enemy. So much so that the opposing forces sought outside help. They enlisted the aid of a group of elite demon hunters. Their name: the Ephemerine Angels