Fairy tail: the dark flames (remastered)

Natsu, king of demons, has come to earth to fulfill his father, the original satan's, dying wish.
"Conquer earth, give the demons a new place to live, instead of this horrible underworld."

Lucy, the best celestial wizard of Fairy Tail, Is just like any other girl, looking for love (and rent money).
"I'm just waiting for the right man, someone to make my dreams come true."

When the two meet, they both get more than they bargained for.
Natsu finds a woman that might make him turn good.
And Lucy finds herself falling in love with the devil.
But no matter what she does.
Will it be enough
to change
Satan?