Heavenly Swords of the Twin Stars: Volume 3 by Riku Nanano

An invasion from the powerful Gen Empire is on the horizon, and after the ill-fated Seitou battle left the Chou family army as the only military force able to defend Ei, Emperor Adai Dada plans on completely wiping them off the map with a final attack. Unfortunately for Sekiei and Hakurei, overwhelming external threats aren’t the only thing they have to deal with; spies, conspiracies, and corruption are flourishing within Ei’s borders. These are the worst odds they’ve ever faced, but that won’t stop them. With just a genius merchant, a strategist, and the unwavering loyalty of their outnumbered soldiers, this undefeated general princess and reincarnated legendary hero must stand between Ei and total destruction. The stage is set for the final showdown.