M. L. Wang’s 2019 The Sword of Kaigen: A Theonite War Story is a standalone novel set in her Theonite universe. Sword won Mark Lawrence’s 5th Self-Published Fantasy Blog Off (SPFBO).
The Kaigenese Empire is the greatest of all nations! Its economy is thriving, its people are consumed with patriotic fervour, and its military is second to none. Or as someone willing to attract the ire of the Empire might phrase it, its economy is struggling, the penalties for dissent are severe, and its military is a joke.
The Empire does have one undeniable asset: the warriors of the Kusanagi Peninsula.