Zinzuki Kerulaii is a swordsman under the former command of a crime boss named Hamiki. After discovering that Hamiki had been limiting his full potential as a swordsman he decided to quit as his right hand man and pursue him. Upon looking for Hamiki, Zinzuki instead encountered one of his former slaves Jen and they conversed. She told Zinzuki about Hamiki's whereabouts and that Nitro V. Kaian, a rookie pirate, had saved her and is fighting Hamiki. Zinzuki then went to their whereabouts to find Nitro laying on the ground, having been exhausted from defeating Hamiki single-handedly, and decided to join Nitro's crew, the Thunderscars Pirates.