CoroCoro Comic (コロコロコミック, KoroKoro Komikku) is a Japanese children's manga magazine published by Shogakukan. It was established in 1977 and several of its properties, like Doraemon and the Pokémon series of games, have gone on to be cultural phenomena in Japan. The name comes from a phenomime korokoro (ころころ) which means "rolling" and also represents something spherical, fat, or small, because children supposedly like such things. The magazine is A5-sized, about 6 cm (2+1⁄4 in) thick, and each issue is 750 pages long. CoroCoro Comic is released monthly with new issues on the 15th of each month (or earlier if the 15th falls on a weekend). CoroCoro Comic sold 400 million copies as of April 2017, making it one of the best-selling comic/manga magazines. The magazine has three sisters: Bessatsu CoroCoro Comic (別冊コロコロコミック), CoroCoro Ichiban! (コロコロイチバン) and CoroCoro Aniki (コロコロアニキ). Bessatsu and Ichiban! are published bi-monthly, while Aniki, which targeted an older audience, was released quarterly. On November 20, 2020, CoroCoro Comic cover designer Tariji Sasaki was recognized by Guinness World Records as the longest-running cover designer for a children's magazine. CoroCoro Aniki ended publication in March 2021. Source: Wikipedia (en)