Chidori ("One Thousand Birds") is an example of nature manipulation created by Kakashi Hatake after he failed to infuse his own nature manipulation with the Rasengan. The Chidori requires the user to channel a great deal of lightning-based chakra to their hand, so much so that the ordinarily invisible chakra becomes visible to the naked eye. Due to the high concentration of electricity the attack creates, it emits a sound that is reminiscent of chirping birds (hence the name). Once the attack is formed the user rushes at their opponent and thrusts their arm into a certain part of the body, such as the heart. While the technique is usually fatal to its target, the speed at which the user moves causes them to experience tunnel vision, leaving them open for attack. If the user possesses a Sharingan, however, they are able to take in more detail whilst moving, allowing them to avoid counterattacks.
The Chidori requires a great deal of control in order to be properly utilized; Kakashi, being the creator of the technique, has reached the peak of control over the ability. Because of this, Kakashi's version is referred to as the Lightning Blade (雷切, Raikiri), a higher ranked form of the ability with which he was once able to split a bolt of lightning (hence the name). Due to the high levels of chakra required to form the technique, those able to perform it are limited to very few usages a day. Kakashi is only able to use his Lighting Blade four times a day in Part I.