Chapter 1 - The Calm

Toshinori was the original captain of the All Might. One day he just disappeared, along with his very, very large crystal, stocked full of powerful magic. It is now the race of the century, as everyone wants the power to finally win the age-old war of the sea. However, not only is the map left behind for any potential heirs infuriatingly vague, but there are numerous obstacles to overcome.
What happens when the world's most infamous pirate is rumoured to have the mythical map?

Language warning (there's Bakugo, duh)
General violence warning, with swords and blood and stuff...
Shoto POV
Pirate AU
Primarily TodoBaku, but with very (very!) small TodoDeku hints.