Devilman Crybaby: The Man In Blue (Male Reader)

(Y/N): "Slay All."

Dante: "We are the sons of Sparda. Within each of us flows his blood. But more importantly, his soul! And now, my soul is saying it wants to stop you!" He said.

(Y/N) Sparda AKA Demon King.

Dante and (Y/N) are the sons of Sparda and the Demon who protect the mankind from the attack of demons and Sparda was the Dark Knight who betray his own kind for his own love one Eva...then he was with her married and born two children as siblings that they are the boys...which they are Nephilim. Then our story back to (Y/N) Sparda the Elder brother had a Yamato sword who can cut through any portal to go anywhere he can by himself...him and his brother finish the demons who were invaded the world of mankind and finish Mundus once and for all...but it turns out (Y/N)'s duty been moving out into different universe.

When he went into different earth and universe and he will learn about this world there were demons are exists among the humans...also his mission and job were slaughter the demons by himself and get motivation. But when he meet a god who want him to terminate this devil name Lucifer AKA Satan...The King Of Hell and this is how he is going to get started and what would Akira Fudo going to do when he meet (Y/N)...will he face him? Or maybe he find out he is Nephilim.