FAIRY TAIL:I AM THE STRONGEST

I find myself in another world without any system except an old man who decided to choose me as his successor. "Natsu looks at me, you are not the only one who can do Dragon Slaying Magic." "Look, Gray, this is what I call Devil Slaying Magic." "Master. I also make my body grows bigger like you." "Laxus. Let's whose lighting is stronger." "Gildarts, fight with me, I want to get become the newest Ace of Fairy Tail."