One Piece: With Ryujin Jakka Novel

Ryuya finds himself transported to the One Piece universe, trapped within Doflamingo's deadly birdcage. Fortune smiles upon him as he awakens a sign-in system, granting him Ryujin Jakka, the most powerful fire-type Zanpakutō. Wielding flames that can reduce everything to ash, he quickly gains notoriety throughout the seas. His mysterious actions frustrate the Five Elders, raise Sengoku's suspicions, and shock even Akainu, whose own fire abilities pale in comparison. Meanwhile, Red Hair Shanks seeks to forge an alliance with this enigmatic newcomer. By signing in at various islands, Ryuya accumulates incredible rewards through his pirate travel system, propelling him to become the mightiest force on the ocean. Known by the code name White Dove, Ryuya's journey through this two-dimensional world reshapes the balance of power in the One Piece realm.