Pirates: The system is not activated until you are a hundred years old

Traveling through the world of pirates also comes with a system.
Ron felt that he would soon be like the protagonists in major novels, crushing all the way and quickly reaching the top of his life.
But there seems to be a bug in the system and it has been unable to be activated.
Fortunately, Ron is from Earth and knows the plot development of One Piece.
So, in the following time, he adopted a little kid in this world, and that little kid’s name was Monkey D. Garp.
After joining the navy, he became a brother who lived and died together with a sailor at the same time. The sailor’s name was Sora.
Later, he accepted several apprentices in the navy, and these apprentices were named Warring States, Zefa, and He.
One hundred years later, when Ron, who refused to accept aging, was training his great-grandson Monkey D. Luffy, he finally realized that his body had been eroded by time.
Just when he was ready to accept that this was the end of his life.
The system that had been loaded for a hundred years was finally activated.
Looking at the first task that popped up on the system, Ron couldn’t help but complain.
“No, I’m already a hundred years old, you want me to be a general?”
This book is also called “Pirates: I’m a hundred years old and you want me to be a general?” “