Sisters of the Sword by Maya Snow
Sisters Kimi and Hana are daughters of the Jito, a noble of Japan. When their uncle murders their father and older brothers, Kimi and Hana run away to find their mother and younger brother, who is now the heir. The girls dress as poor farm boys and act as servants in a samurai school. But one of the students is their cousin, and the son of their evil uncle. Will Kimi and Hana be able to stay hidden long enough to find their mother and brother and bring them to safety?
Next book: Chasing the Secret