We all have at least once thought of living in the world of One Piece...but surely living in the body of Usopp barely enters our mind.
Let's see how our protagonist finds his way into this world of One Piece after being transmigrated into Usopp's body. Though initially disappointed he works his way through with what he has and embody's a positive mindset to pave his way through this world.
Unbeknownst to him, the initially known pathway slowly diverges into something entirely unknown to the point where what was formerly known could no longer be relied upon. Personally, I dislike long summaries so let's end this at that.