The Secret of Enma! The Cursed Sword Entrusted to Zoro

Zoro struggles against King as Emma constantly drains his Haki. When he's thrown back inside, Zoro recalls how he learned of the battle cry, "Sunacchi" and how Momonosuke was prohibited from uttering such cry. He also recalls Hitetsu explaining that his two swords, Wado Ichimonji and Enma were both forged by the legendary swordsmith, Shimotsuki Kozuburo. Zoro then remembers how 13 years ago in his home village, a old man who was rumored to have been a samurai told the phrase "Sunacchi". The old man latter explained Zoro to that every sword had a personality and that it was a swordsman's job to tame them and that a "cursed sword" is a fine sword that was simply called as such because the weak feared it. The old man recalled the greatest sword that he forged that he dubbed "the great king of hell." Remembering all these, Zoro realizes that the aforementioned sword―the great king of hell―was none other than Enma. Outside, Momonosuke accidentally grasps Kaido's flame clouds and realizes that since he is also a dragon, he can also control and manipulate the cloud and proceeds to try and divert Onigashima's path. Inside the castle, the CP0 agents begin to overpower Drake and Apoo when Inbi and Zanki arrive. Meanwhile, Zoro remembers that he learned that the old was Kuina's grandfather after his death and that his village was founded by a pirate. It wasn't a coincidence that the village was named Shimotsuki. Hitetsu mentioned that Shimotsuki Kouzaburou, had left Wano more than fifty years ago. Zoro deduces that the old man and Kouzaburou are one and the same. He remembers Kouzaburou explaining that it is the sword that chooses its wielder. With that, Zoro understood that Enma chose him and was simply testing him. Zoro then recalls the night he and Kuina made their promise to become the world's strongest swordsman, her death and him taking her blade to keep their promise. Back to the present, as a group of Beast Pirates arrive to attack him, Zoro realizes that Enma was not draining him out of malice and admits that he was simply lacking thus unable to withstand the sword unlike Oden who had been using it with ease even though the sword took away so much of his Haki. Zoro tries to figure out how to control the flow of his Haki and keep it from being depleted and ultimately causing his death. Rather than fighting the sword's effects, he decides to let Enma take his Haki instead and "conquers" it, unleashing his Conqueror's Haki and rendering the nearby Beast Pirates unconscious. King notices and asks if he was trying to be a conquer. Remembering when he first met Luffy, Zoro answers by saying that he just remembered his promise to his captain and his best friend.