One Piece: I Just Became Hokage, and Garp Asked Me to Come Out of Retirement

After transmigrating into the world of One Piece, Luo Kai awakens the Naruto System. Signing in grants him the abilities of the Hokage throughout history. Luo Kai immediately chooses to join the Marines, the world's greatest force, and begins a life of lying flat. While great pirates like Rocks, Golden Lion, and Roger roam the seas, and Marines like Garp and Sengoku fight fiercely, Luo Kai is on a small island in the East Blue, eating hot pot and singing, occasionally catching a few bandits. At last, when retirement age arrives, Luo Kai, who has spent his whole life doing nothing but eating, drinking, and having fun, is ready to start his retirement. But then… the Summit War breaks out. The Four Emperors' pirate crews join forces to attack Marine Headquarters. The Admirals are beaten until they doubt their own existence, and the Vice Admirals are routed. Just when everyone thinks the world is doomed, a “little-known” old Marine appears. Big Mom: “Wind Style, Lightning Style, Water Style, Fire Style, Wood Style… Why can he use so many different abilities?!” Kaido: “Damn, that Tailed Beast Bomb really hurts! Anyone who calls me the Strongest Creature from now on is asking for a fight!” Whitebeard: “Is the Tremor-Tremor Fruit really that powerful? That's because you've never seen Luo Kai's Ultimate Attack: Buddhist Statue!” Luo Kai figures that since he has finally come out of retirement, he might as well deal with the Celestial Dragons while he's at it. And so, the Five Elders are in tears, and Im is panicking.