How a Realist Hero Rebuilt the Kingdom Novel Volume 5 features story by Dojyomaru and art by Fuyuyuki.

Souma visits Lagoon City, where he finds Castor waiting for him. But Souma is prepared for the encounter, and has an ace up his sleeve! Castor is left dumbstruck when the king unveils a top secret project he’s had the National Defense Force working on. Just what is Souma planning, and what role does he intend his disgraced former General to play in it?