CoroCoro Ichiban! (コロコロイチバン!) is a sister publication to Monthly CoroCoro Comic (月刊コロコロコミック) published by Shogakukan. The first issue of CoroCoro Ichiban! was released in March 25, 2005 and it is aimed at elementary school students. CoroCoro Ichiban! is often abbreviated Coroichi (コロイチ)
CoroCoro Ichiban! ran Mutant Turtles: Ore Tacha Kame na 4 ningumi (ミュータントタートルズ 〜オレたちゃカメな4忍組〜) from 6/2014 to 5/2015.