Naruto: Starting with Controlling Uchiha Itachi

In the fifty-fifth year of Konoha, the civilian ninja Xia Mu Shijiu looks at Uchiha Itachi before him.

A System starts chiming in his mind.

[Congratulations, Host. You have successfully activated the World King Saint Imu System.]

[World scan complete: One Piece world.]

[A descendant of Davy Jones has been detected ahead.]

[Host, please eliminate the relevant targets of the D. clan as soon as possible.]

[God Valley mission initiated!]

I'm Imu?

But this isn't the One Piece world. It's the Naruto world.