User blog comment:B214/Question and Answers/@comment-220.255.2.87-20130420091724/@comment-6977593-20130420101741

The manga follows the events from the Light Novel, while the anime follows a different agenda. So they're probably going to skip over that part, though it wouldn't make that big a difference to the story line, since they could've introduced the Student Council anytime during The Red Dragon Emperor's Awakening arc since they don't actually play a role in the story until the Birth of the Breast Dragon Emperor arc.