Across the valley, a drumbeat echoes. For ten days, the drum will call the mountain ryus to war, including the samurai kids from the Cockroach Ryu. Only Japan's feudal emperor can stop the war, so Niya and Sensei Ki-Yaga set off on a grueling journey with all the Cockroaches, whose firm friendship and unusual skills must be put to the test in order to beg the Emperor to maintain peace. Sensei Ki-Yaga is respected and wise, but unfortunately, the last...

Niya Moto is the only one-legged samurai kid in Japan, famous for falling flat on his face in the dirt. The one school that will accept him is the Cockroach Ryu, led by the legendary sensei Ki-Yaga. He may be an old man overly fond of naps, but Ki-Yaga is also known for taking in kids that the world has judged harshly: an albino girl with extra fingers and toes, a boy who is blind, a big kid whose past makes him loath to fight. A warrior in his time,...