One piece: Norowareta seiken

The Straw Hat Pirates arrived at Asuka Island, the location of the world’s most precious blade: The Seven Star Sword, rumored to bring misfortune to anyone who possesses it. Upon returning to their ship, the Going Merry, they realized that Zoro had vanished from his post. Before they could organize a search for him, Luffy and his crew had to flee the port as they were being pursued by the Marines. They eventually found a new docking spot near a village tasked with keeping the Seven Star Sword sealed. However, the village soon came under attack by the Marines, and to their surprise, Zoro was among them. Luffy and his crew were puzzled by Zoro’s alliance with the Marines, but everything became clear when Luffy met Saga, Zoro’s childhood friend from his swordsmanship training days.