Help me find the name of the manga

[Likeaboss612]

The demon king (with white hair) forms a party to defeat demon kings, each time he kills one he gets closer to being a human (also weaker). I also remember he killed his party members first few chapters

 

[lafayette94]

https://mangadex.org/title/17945/adu-of-hades

 

[Likeaboss612]

@lafayette94 thank you so much