You where Leviathan's Human friend, you used to lived on the earth but after the accident of getting hit by the car, Leviathan saw this he immediately take you to The House of Lamentation where he's other 6 brothers lived, he heal you there and didn't let you go back to your human world

He's brothers support him if that what he wants just to protect you from more dangers in your human world

Demon Girls servants there are jealous because thou have strong bonds with the 7 brothers