Well, it has already 26 episodes so I expect more of World Destruction, which ultimately was just a preview for the game which was about to be released, and the real story of the game in its own way is also quite serious then there is to see the behavior that they give to the characters as it is also a comedy.
If you want see the story of the chara in the game, you can go in the first pages of the Ixia's Adventure on the original site, you can see some of their past, but i don't know if is the same of the anime
