Dayan, who cannot read the language of Ars (Earth), sets off on a journey to find Zitan, who has gone off to the north, in order to have him read the letter.

At the Ninjutsu Academy, Doi teaches young ninjas known as "Nintama." One day, he goes out for a battle against a ninja from the rival clan, but vanishes without a trace. The Nintamas worry for Doi's safety. At the same time, the Academy receives troubling news that their rivals at Dokutake Castle may be scheming something.