Well, the anime one at least. The manga crossover has already been printed in Japan back in April, but apparently the anime version is set to air very soon. The Gintama version (by Sunrise) will appear on Sept. 26, while the Sket Dance version (by Tatsunoko) will premiere three days later on the 29th. Those who have seen a little of each series might have thought there were some similarities in tone. Well, guess what? The creator of Sket Dance used to be an assistant for the creator of Gintama before he started his own story.