Mireilla Miller's Road to Stardom.

A normal boy is reborn in the body of a NEET that has the same name as his, Mireilla Miller. But in this strange world, Mire will use his new System to become famous. From a fleshy guy that sits in his room all day watching anime, to becoming a handsome guy that streams Counter-Strike from his bedroom, then finally becoming a Celestial Prince that will have his face on every corner of the country! He's Also Not A Twat Like Tired123 And Monarch_Of_Death, though Monarch is also a scammer.