I need this weird Splatoon animation

It was like 10 years ago 2015/2016 and it was a weird animation of an inkling walking on a sort of no man's land and there was a giant squid in the background and the inkling walked and took a weapon and killed themselves I think they were purple not sure though I looked everywhere for this animation and I couldn't find I'm sorry if this is vague or that my English is bad