She is Mafuyu Asahina. Depressed, wanting to disappear. "Mind F#$&" - Mafuyu stuns opponent and forces them to feel her pain. "Flash Fury" - Mafuyu slashes with her knife at a fast speed. "Knife Impale" - Mafuyu grabs opponent and stabs them in the guts, dealing bleeding damage. "Nonexistence" - Mafuyu fades from reality, rendering herself invisible to opponent. She can also fight normally with her knife.