Demon Slice (隠忍斬 - Onigiri, lit. "Hidden Ninja Slice") is Yagyū's Ultimate Secret Ninja Art in Senran Kagura: Shinovi Versus and Senran Kagura: Estival Versus. It requires five of Ninja Art scrolls to use.
Yagyū drops her umbrella and grabs her eye as though it were in pain. She removes her eye-patch and the usually covered eye begins to shine bright red. Three tentacles soon protrude out of it and begin smacking her enemies repeatedly.
(Yagyū becomes able to use it after completing Chapter 4 Mission 03 and must be at critical health to use it.)
Yagyū takes hold of her eye-patch before she removes it, revealing her concealed eye. This eye allows a red, demon-like squid to prod its tentacles through and as they begin to viciously smack her enemies repeatedly.