Mellow Squid 4-Panel Comic
From Inkipedia, the Splatoon wiki
Mellow Squid 4-Panel Comic is a four-panel manga series featured in Weekly Famitsu magazine with illustrations from Kino Takahashi. It revolves around different characters from the Splatoon series, showing different scenarios with each, where the main character is an Inkling girl with orange ink and also acts as Agent 3 shown with green ink.
A comic book compiling the previous comic strips based on the first Splatoon game was released on 15 June 2017 and features 118 pages.
These comic strips are also featured, translated into English, in The Art of Splatoon and The Art of Splatoon 2.