Unifying the Grand Line and Setting Sail in a Parallel World

Arthur Pendragon transmigrates to a parallel pirate world where demons have turned cannibalism into a pastime. With the British System at its core, he builds the Holy British Empire one step at a time and rises to become the ruler of the world: the Lionheart King!

Just when he thinks it will all come to an end, the gates to parallel worlds suddenly open.

The Celestial Dragons all turn into demons and devour the world.

Kaido becomes a nine-headed Azure Dragon, sweeping across the entire world through all-out war.

Akainu purges the pirates and rules the world with absolute justice.

Rocks wins big at God Valley and reigns over the entire world.

One parallel world after another unfolds before him, and Arthur leads the entire Holy British Empire into battle across the pirate multiverse.

Until he finds the core pirate world and becomes king of the pirate multiverse!

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.