Splatoon 2: The Sunken Stories | (#1)The Octarian Mysteries

This story follows an inkling named Jet, who goes on an adventure to find his brother, Echo. But Echo is different from a normal inkling. He's got strange looking tentacles for hair, he wears gloves, and he doesn't have the eye line that all inklings have, but Jet's parents say it's a birth defect, but is it true? Eve...