One Piece: I, Roger's Son, Luo, a Nine-Year-Old Marine Admiral!

After transmigrating into the world of One Piece seven years ago, the thoroughly ordinary Iger thought he could just coast through life.

But three days ago, Iger found out that he was the twin son of the late Pirate King, Roger!

Ace is his older brother, the old man who raised him is Dragon, and that means he has to call Garp Grandpa!

Iger was instantly thrown into chaos.

“Ding! Congratulations, Host, you’ve obtained the Myriad Worlds Sign-In System!”

“Ding! Sign-in successful. Reward: Sand-Sand Fruit ability, Level 6!”

“Ding! Sign-in successful. Reward: Supreme Swordsmanship, Level 5!”

“Ding! Sign-in successful. Reward: Rumble-Rumble Fruit ability, Level 6!”

As he keeps signing in every day,

by the age of nine, Iger becomes a Marine Admiral!