One Piece: My Crew Uses Zanpakuto

Ikki Kurogane transmigrates through the world of One Piece and awakens the "All Great Swordsman" system. By defeating swordsmen of the pirate world and claiming their legendary blades, Ikki can participate in the system lottery. To his surprise, this lottery allows him to draw zanpakuto from Bleach! With this knowledge, Ikki sets his sights on various swordsmen across the Grand Line. When the Summit War erupts at Marineford, Ikki arrives with his partners, each wielding extraordinary weapons: Ikki: "Cleave the heavens and moon, Zangetsu!" Nami: "Pierce, Gonryōmaru!" Nojiko: "Purify all, Minazuki!" Robin: "Scatter, Senbonzakura!" Kalifa: "The Flowery Winds Become Disturbed, The God Of Flowers Sings, The Heavenly Winds Become Disturbed, The Devil Of Heaven Sneers, Katen Kyōkotsu!" The assembled Marines and pirates at Navy Headquarters fall silent in shock. Fleet Admiral Sengoku: "All Great Swordsman? What manner of power is this?" Dracule Mihawk: "Zanpakuto? Impressive blades indeed. But to think you could take my sword... How amusing." — Description from novelcodex.org