"Lord Mirai, are you leaving already? I've prepared a banquet at the palace. We only need you to come over for it to begin!"
Just as the Immortal was about to depart, Neptune hurried over with a group of soldiers. Queen Otohime had come with him as well. They had been surrounded by Kaido for over a month and had suffered terribly. Not only Neptune, but every resident of Fish-Man Island was deeply grateful to Mirai for driving Kaido away, and they hoped to satisfy him as much as possible in material terms.
Mirai sat in a chair on the deck. He glanced down at Neptune and the others, then looked at Queen Otohime before speaking. "No need. I didn't deal with Kaido to protect you. He simply had the nerve to offend me. Now, I'm going after him. Those who make an enemy of Mirai Uchiha never get off easy!" He paused, fixing his gaze on Neptune once more. "More importantly, let me offer you some advice. In the next few years, your queen, Otohime, will face a mortal crisis. You should find a way to strengthen your security."
Judging by the timeline, Otohime would indeed be killed within the next few years. In the original story, Luffy was nineteen when he arrived at Fish-Man Island, while Shirahoshi was one year younger than him, making her eighteen. According to Neptune and the others, ten years ago, Celestial Dragons had come to Fish-Man Island to capture a runaway fish-man slave, and had formed a certain connection with the island. After that, Queen Otohime was murdered. Shirahoshi was only six now, which meant that Otohime would die two years from now.
Mirai had no obligation to save her, but he did not mind wasting a little time to give them a