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This article, Koutetsu, is property of RowanWolfblood109.

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Kanji 甲鉄
Rōmaji Koutetsu
Literal English Armor
Classification Hiden, Chakra Control Technique, Ninjutsu, Fighting Style, Nintaijutsu
Rank A-rank
Class Offensive, Defensive, Supplementary
Range Short-range
Other jutsu
Parent jutsu
Derived jutsu
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Related jutsu

Koutetsu (甲鉄, Literal Meaning: Armor) is a nintaijutsu in which the user erects a powerful chakra mode over their body, using the Rōtasumāku as a source for delivering vast amounts of chakra in a constant flow. Whenever the chakra flows from the mark at the user’s lower nape, the chakra erects itself into a strong and powerful barrier or layer of chakra around the user’s body and acts as armor which can protect the user from most physical and ninjutsu-based attacks like a suit of armor.

With training and having a strong mental fortitude, this technique can be mastered to the point of controlling, manifesting, and activating it at will. For example, Shindō Shunsoku only used Koutetsu on his hands to stop Neji Hyūga from using his Eight Trigrams Palms Revolving Heaven with great effort and preventing his Gentle Fist from shutting off any of his tenketsu because of the Rōtasumāku. He also used it against the Fourth Raikage and Danzō Shimura.


  • Unlike Kyōka-tai, Koutetsu refers to chakra that is visible or present outside the body, not just inside it since it covers the user person in a similar way to Naruto Uzumaki’s Nine-Tails Chakra Mode. It functions much the same way as Kyōka-tai in almost every other way.