Secret of the Ninja

Ominous things are happening at the ddojo of your friend Nadapowerful thunderstorms in the middle of dry season, objects that move by themselves, piercing sounds coming from empty rooms. Nada traces it all to the arrival of a samurai sword from an anonymous benefactor. You may have to learn the secret arts of the ninja to help Nada vanquish this sword threat. You must learn to move without sound, fire weapons without force, and walk in the invisible realm of kuji.