My name is Echizen Ryuya, I have a miserable life experience, the cutest sister in the world, a life mentor who retired to the countryside as a "former world number one", I am teammates with a group of interesting people, and I am an enemy of many people.
As a wandering solo traveler, I was obviously the standard male protagonist of a shounen manga, but suddenly one day, I discovered that my sister was the protagonist of the shounen manga.