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The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom.

Yamato, Naruto Uzumaki, Sakura Haruno, and Sai are assigned on a mission to capture Mukade, a missing-nin. They all have chakra-knives, which are uniquely-designed trench knives that allow a ninja to infuse their chakra with it to produce an added effect.

When a great demon fox attacked Hidden Leaf Village, a powerful man known as the 4th Hokage had sealed the demon inside a newborn named Naruto, who then grew up detested by his fellow Leaf villagers. As a child, Naruto is isolated from the Konoha community, who regards him as if he was the Nine-Tails.