Comment by Figure it out on FIRST BLACK KING

Afterwards , mc will go into future , from where he got the nano and his descendent who came in the beginning to inject nano and there he will become literal God, the realm of OG HEAVENLY DEMON(tho not exactly as strong as HIM) 
This setting is in future
Hence the title,'Descent of the Demon God' 
If u ever read the word 'DotDG' , it means this title only
Hope it helps