About the Fact That I Can Absorb Other People's Inner Energy

A lonely office worker came to a different world with the Great Devouring System, and went from being a mortal to the top of the world. "You are good at martial arts, but it's a pity that it will be mine in the next second." What? You have been practicing for sixty years, and I have just practiced for an hour! "What?" Is this world still weird? ? ?