"I'm Luffy, and I'm going to be a pirate!"
"Oh, I'm Savalane. I'm going to be the king of lying flat."
"Hey, that's awful of you! Then I'm going to be the Pirate King!"
Savalane accidentally transmigrated to the world of pirates and was stranded on a deserted island with seven-year-old Luffy. Given a second life, he swore he would keep his head down and grow stronger this time. But danger struck when a gigantic Sea King suddenly attacked.
At the brink of death, he awakened the [Mythical Worlds System] and gained a Zoan Devil Fruit, Mythical Type, Azure Dragon form, successfully driving off the Sea King.
He thought awakening the System meant he could relax and begin his carefree life in another world. But the first mission the ridiculous System issued was impossible for him to accept:
"Within 15 days, sever Shanks's arm by any means necessary. Fail, and you die."
To stay alive, he used memories from his previous life to impersonate the Lord of the Coast and successfully bit off Shanks's arm. But that single bite sent Savalane down a path of no return as the System's missions kept coming.
One companion after another joined him, and his bounty soared. The Revolutionary Army, the giants, the Four Emperors, the Straw Hat Pirates, civilians, the Marines... all became entangled with him in countless ways.
In the end, as Savalane stared at the Empty Throne before him, he said with a bitter expression, "I never wanted to become the World's Strongest!"