Attack of the Twin Demons

The technique allows Sakon and Ukon to merge their bodies using their kekkei genkai. Typically, Ukon is dormant within Sakon's body, with only his head protruding from the back of Sakon's neck, although he can move freely inside of and protrude any part of his body parts from anywhere on his brother's body.

Kabuto's usage of this technique differs as it merely creates a copy of Sakon that has the ability to morph into the shinobi whose DNA he has assimilated, including the Sound Five members (Kimimaro, Kidōmaru, Tayuya and Jirōbō) and Orochimaru. When he used this technique, he called it "''.