when your parents died, you lived with your aunt and uncle, but they treated you badly that made you cry in your room alone all night...One day, it was midnight and you were asleep, You heard noise from outside your room and when to check it out..you found a tall handsome demon killed your aunt and uncle with no mercy. He turned to you and walk towards you, he bow to you..

"I am Lucas...your Guardian Demon for now on.."