How a Realist Hero Rebuilt the Kingdom Novel Volume 13 was written by Dojyomaru with illustrations by Fuyuyuki.

Risking her life to save her homeland, Shabon, a princess from the Nine-Headed Dragon Archipelago, joins Souma’s side in hopes of stopping an impending war. But with a fleet already en route to the hostile archipelago under his orders, Souma sets out on an infiltration mission before it arrives, and he discovers that the real threat is a massive creature in their waters that defies all common sense!