A Dagger in the Light — Travis Bughi

Takeo Karaoshi has never had the respect he deserves as master warrior, accomplished tactician, and survival savant. One would have to be a fool to ignore the threat he poses, and yet he's been overlooked countless times and betrayed many more.
Until now.
After defying the Katsu horde, Takeo has earned the de facto command of an army, a legion of fanatical followers, and a sliver of respect at the generals' table. It might just be enough to win against the Nguyens and the rakshasa pulling their strings. Except there's one problem. He has many, many enemies.
And they're taking him seriously, too.