The Grudge Syndrome

In the world of Inkopolis, squid kids and octo kids compete in war-like battles with turf for fun. Enjoying themselves, they live their lives trying to be the freshest on the block and showing off their sick skills. Word got out about an accident involving S4 member Aloha, S+ ranker Rider, and that one blue haired kid. Their teammates and friends meet up with them to see if they are alright, but something strange starts to happen. It's not just Aloha acting weird anymore, it's everyone.

DISCLAIMER: This is a fanfiction of the Splatoon CoroCoro manga by Sankichi Hinodeya. I do not own these characters nor do I encourage the violent actions in this story. These events do not happen or relate to the real characters or the real manga. There is swearing, violence, gore, and minor head canons. Some events may be sensitive to some readers.

Cover art created by the second writer.
Second writer: @enperryart (wrote as Rider, Stealth Goggles, School Uniform, Gloves, Emperor, Eging Jr, N-Pacer, Squinja, Inkfall, Mask, Designer Headphones, School Asymmetry, and other minor characters in the Square.)

(@PickledPlun wrote as Goggles, Aloha, Specs, Headphones, Bobble Hat, Snorkel, Octoglasses, Straw, Bamboo Hat, Skull, Prince, Full Moon Glasses, Jersey, Straps, Clip-ons, Half-Rimz, Army, Iromaki Rangers, Tennis Headband, School Short, School Long, School Bun, Clams Facemask, Knit Hat, Hockey, Hachi, Nana, Afro, Pony, Laceless, Backwards, Jungle Hat, Beanie, Cleats, and parts of characters listed above.)
Setting and location descriptions vary between writers.