This is an original Lightning Release technique by Ahatake Kurosaki. It's basis is the Chidori and as suck=h the hand signs are the same. After the Chidori is formed the user uses Chakra control and Shape manipulation to change it to the shape of a sowrd. Ahatake himself uses his own sword to focus the Chidori instead drastically increasing it's cutting power. This is part of the Lightning Release Focal Point series by Ahatake