The Lost Ninja

From publisher blurb: Can You Rescue A Fellow Ninja From The Hands Of Japanese Gangsters? You are a skilled fighter, well versed in the martial arts and the art of ninjutsu. One day you are talking with Saito, a strange boy from your class, when a car suddenly pulls up. You watch as two men jump out, shove Saito into their car, and drive off. Everything happens so fast. You're not certain, but you think the men are yakuza, a ruthless band of Japanese gangsters. You want to do something to help Saito, but what?