The Giant of Light on the Grand Line

After an accident, Li Mu, an employee at a media company, transmigrates to the world of One Piece and arrives in the era of Rocks!

What? The era of Rocks?

The pirate world was even more brutal then than in Luffy's era. Just surviving would be a challenge.

Fortunately, he activates a System and is surprised to discover that he can transform into Ultraman!

He thinks that with Ultraman's powers, he can finally rest easy.

Until one day, a gigantic creature called a "monster" emerges from the depths of the sea.

Ultraman? Little monsters? This world has gone completely off the rails!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.