Idea #1

This is a fan-fiction between ATG and One Piece

The story is someone die and reincarnate ( or transmigrate, etc...) in the world of ATG ( in the body of Yun Che or not, with a system or not it's your choice ) with the power of Gomu Gomu no Mi and because of apparition of a Demon Fruit the whole world of ATG change and Demon fruit start to appears all around the world. After it's you to imagine what going to happened if possible let the weakness of Demon fruit