I GOT REINCARNATED AS A DEMON

The main character (mario nakano) was a lonely teenage boy who lived a boring life until he died and got reincarnated as a demon with the task of kill the current demon king/ lord on his quest he created a peerage and with his peerage he will fulfil his quest and after he finishes his quest maybe he fall in love with one of the or all of them who knows (definitely not me )