The E.N.D

They have been rivals since they were kids, but they always had each
others backs. With the events of Tartarus behind them, there have been
new revelations, and one of these has led to a fight between two of the
most famous members: Natsu Dragneel and Gray Fullbuster. Who will win?
Will they be able to defeat the demon, or will it destroy them? Spoilers
for chapter 416