Chakra Blade: Straight Line

First the user holds the trench knife right-side up. Then after infusing chakra into the knife and further expanding the blade's length, the user slashes horizontally at the opponent's neck to decapitate them.

Trivia

 * While not named in the anime or manga, it was named in Naruto Shippūden: Ultimate Ninja Storm 2.

es:Cuchillas de Chakra: Linea Recta