What magazine serialized the original Splatoon manga?

The original Splatoon manga was serialized in CoroCoro Comic.

The manga is a Japanese action-comedy adaptation of Nintendo's Splatoon games, illustrated by Sankichi Hinodeya. Its serialization began in Shogakukan's CoroCoro Comic in 2016, following an earlier one-shot published in CoroCoro in 2015. The story focuses on the Blue Team, a group of Inklings competing in Turf War battles, with Goggles serving as the central character.

CoroCoro Comic is a long-running Japanese children's manga magazine published by Shogakukan. Founded in 1977, it became known for serialized works connected to major games and children's franchises, making it a natural home for a manga based on Splatoon's competitive, character-driven world.

The series was later licensed in North America by Viz Media, and a motion-comic adaptation appeared on CoroCoro's YouTube channel in 2017. The manga eventually covered material connected to later games, including a continuation titled Splatoon 3: Splatlands.

Readers sometimes confuse CoroCoro Comic with Bessatsu CoroCoro Comic, another magazine in the same publishing family. The original Splatoon manga is conventionally identified with CoroCoro Comic.