You Don't Deserve the Archangel's Mercy

Posing as a humble estate groundskeeper for a decade to honor an old vow, a supreme archangel secretly seals a demonic entity beneath the manor and tutors the family gifted youngest daughter in protective magic. However, when the elderly patriarch passes away, greedy heirs launch a vicious inheritance dispute, framing the quiet gardener for homicide and condemning him to burn at the stake. In the flames, the celestial guardian reveals his six wings, revokes his covenant of protection, and departs. When the demonic seal fractures hours later and demonic horrors overrun the estate, the ungrateful aristocrats face utter ruin.