Adventuring Other-Worlds with the Adapting System

A young man awoke inside another's body. After fusing both their memories, he realises that he's in another world. He was about to begin his adventure when... [The Adapting system would like to bind to host, Accept?]Please be nice, this is the first novel I've posted on here and while English might be my first language, I'm... not very good at it. Please leave a comment if something is wrong with... back<<