Signing In from the Start on Crocodile's Head!

He transmigrates into the world of One Piece, gets a sign-in System, and becomes a Marine!

"Sign in at Marine Headquarters. Congratulations, you have received..."

"Observation Haki: Intermediate!"

"Conqueror's Haki: Intermediate!"

Ding! Sign in at Crocodile's location. Obtain the power of the Sand-Sand Fruit!

Sand Crocodile: "How is this possible!"

Ding! Sign in at Whitebeard's location... Obtain the Tremor-Tremor Fruit!!

During the Summit War, Blackbeard laughed arrogantly and seemed poised to copy Whitebeard's signature move and destroy Marine Headquarters. But the next moment,

the same power rose up in response!

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