Where did it come from?

(I know that there are some Fairy Tail reacts to Death Battle, but they're either wrong death battles or fan made death battles)
So, Natsu and Happy have broken into Lucy's house, again, but with Grey, Gajeel, Pantherlily, Erza, Wendy and Carla (and Juvia in the window). But they came because there was something in the guild, a box filled with dvd's. All to the same name "death battle"