The Sword of Kaigen
by M. L. Wang
Born into Kusanagi's legendary Matsuda family, fourteen-year-old Mamoru has always known his purpose: to master his family's fighting techniques and defend his homeland. But when an outsider arrives and pulls back the curtain on Kaigen's alleged age of peace, Mamoru realizes that he might not have much time to become the fighter he was bred to be. Worse, the empire he was bred to defend may stand on a foundation of lies.
Misaki told herself that she left the passions of her youth behind when she married into the Matsuda house. Determined to be a good housewife and mother, she hid away her sword, along with everything from her days as a fighter in a faraway country. But with her growing son asking questions about the outside world, the threat of an impending invasion looming across the sea, and her frigid husband grating on her nerves, Misaki finds the fighter in her clawing its way back to the surface.
When the winds of war reach their peninsula, will the Matsuda family have the strength to defend their empire? Or will they tear each other apart before the true enemies even reach their shores?
A rich elemental magic system and deep world-building make this martial fantasy perfect for fans of R.F. Kuang, Brandon Sanderson, Leigh Bardugo, and Lian Hearn.”