Isolation Letter

Goku and Kuririn are given an assignment by Kame-Sen'nin: "Retrieve the sleeping princess from Lucifer and I will take you as my students." But the mission proves to be more perilous than originally thought.

The mother of a feudal lord's only heir is kidnapped by the lord. Her husband and his samurai father must decide whether to accept the unjust decision, or risk death to rescue her.

Demons that once almost destroyed the world, are revived by someone. To prevent the world from being destroyed, the demon has to be sealed and the only one who can do it is the shrine maiden Shion from the country of demons, who has two powers; one is sealing demons and the other is predicting the deaths of humans. This time Naruto's mission is to guard Shion, but she predicts Naruto's death. The only way to escape it, is to get away from Shion, which would leave her unguarded, then the demon, whose only goal is to kill Shion will do so, thus meaning the end of the world. Naruto decides to challenge this "prediction of death."

Kai—an outcast—joins Oishi, the leader of 47 outcast samurai. Together they seek vengeance upon the treacherous overlord who killed their master and banished their kind. To restore honour to their homeland, the warriors embark upon a quest that challenges them with a series of trials that would destroy ordinary warriors.