The Insipid Prince's Furtive Grab for The Throne Vol.1 Part 3

Arnold is a lethargic prince who is ridiculed by the entire empire as an "insipid" runner. But in fact, he is the most powerful prince with a secret identity as Silver, an SS-grade adventurer who manipulates forbidden ancient magic! The story of the strongest prince who plays the role of an incompetent, and his secret struggle for the throne begins!