Aboard the Pirate Seas, I Went Undercover in the Marines from the Start

[Marines + No System + Genius Protagonist]

Fake undercover agent: Three years, then another three years.

Real undercover agent: Rebuilding the glory of the Marines is our solemn duty.

Swordsmanship, physical prowess, Devil Fruit mastery, Haki: I want it all.

A voice for justice, a life devoted to justice, justice until the end.

Look to the world of tomorrow: it will surely be a world of justice.

This is a story about reforming the Marines.