List of anime that adapt manga from Square Enix's "Gangan Comics" Imprint and it's various sub-imprints. [First Seasons Only] The imprint contains manga from: Monthly Shounen Gangan, Gangan Joker, Gangan Pixiv, Gangan ONLINE
This list is for those non-sequel shows that were marked as watched by 3000 people or less. I also excluded shows that aired recently and was watched by more than 2000 people since they will reach the "3000 watched" limit soon.