One piece nami

In this book it going to be interesting. A young boy named Ren, who lives with his mom and older sister in a place called Oren, they went in a hiking trip but his mother died protecting him and while his older sister and him was running he got shot by the people called GenTech. His older sister sacrifice herself to save him but he falls in the tree and down. He and up in a pool of water drowning until a weird creature saved him and he end up in a world of titans which he doesn't know. what…