Here’s an overview (via Gematsu):
A pirate’s life is fun, but dangerous. Go on a journey to the ocean together with the Straw Hat Pirates. The player is an apprentice pirate of the Straw Hat Pirates, and embark on a “one day voyage” on the Thousand Sunny. Adventures and events only unique to virtual reality will unfold, including navy shooting battles and communication events in which you’ll become closer with the Straw Hat Pirates.
You can also check out two screenshots below.
As previously announced, One Piece: Grand Cruise will be playable by up to eight people simultaneously at the “Tokyo One Piece Tower” event on July 22. A launch date and Western release has yet to be confirmed.
We’ll update our readers when we have more info.