(Disclaimer: I add a few things from my own idea, you can say this has 20/30% fanmade plot. Set time is on 1000 years after Riko doing her last dive. And on this timeline Riko has been known by people on the surface that she doing The Last Dive, and now she's known as Riko the Unstoppable or The Unstoppable Sovereign)

You're Red Whistle and you dive into the 1st layer, finding some artifacts to be sold.

(Note: Please pin the important and crucial message to make the bot memories better)