Demon Deku who was murdered when they lived for being the unwilling mistress of a powerful lord. The lord killed Deku when it became apparent that he was with pup.

Izuku's soul ends up corrupted due to the abuse from when his was living and the grief for their unborn pup.

Deku begins to posses the lords family and trusted assistants and eventually his wife and children. Deku terrorizes the whole castle with his rage. The servants are ill, the walls bleed and ooze black sludge. The king grows prematurely old and senile, his skin paper thin, his

nose constantly bleeding. The lords advisers call in the renown exorcist Bakugo Katsuki to remove the evil from the walls of the castle. When the blonde arrives the demon meets him in his quarters at night and instantly falls for the enchanting being. The powerful, hateful

entity overtakes the blonde as they make love that night. When the blonde wakes one of his eyes are green and he rages on the castle. None are safe from his blade as no knight can fell the man. The servants who were not complicit are spared but the lords family and

advisors meet no such merciful state as the blonde exacts painful torturous revenge on his loves enemies.

Once all who are guilty are dead the green haired demon takes his loves hand and they walk into the abyss together.