After the Marines were taken down, Rein leaves to Wano for a job. He meets Kin'emon, who he tells his background to. Kin'emon says that he should help the samurai of Wano and then meets the samurai of Wano, including Kanjuro and Raizo, due to Kin'emon's recommendation. Rein comes up with the hefty idea of teaching them Fishman Karate and Fishman Jujutsu. After their training is finished, Crocodile and Daz Bones attack Wano, but the samurai use Fishman Karate to defeat the both of them.