Some demons and otherworldly creatures love climbing up the power ladder. Shane is not one of these. He likes where he is (thank you very much) and has no interest in moving up. All he wants is to give his friend Ryan a nice birthday gift. So, naturally, everything goes to hell.

It’s funny, Robin notes as she sits on the deck of the Thousand Sunny, book in hand, That the people who are called Demon, Monster, Devil aboard this ship of dreams are not the true Monsters. No, she thinks, watching her crew as they spend the day on the deck of the Sunny, Not monsters at all. - Or: The East Blue has a different nickname to those in the Grand Line, and those who hail it as home have a few... unique traits.

On the high seas pirates draw their power not from devil fruit but with deals with demons, and pay the price in turn. Blood, salt, and water, everyone's soul is on the line, but only if you're fool enough to make a deal.