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Ichi Monji Faiaa (一文字ファイアー (bar shaped fire)) is Sukashii `s Hissatsu attack.

It is perfomed with his Koutou Pikapika sword (光刀ピカピカ (luminous sword pikapika))

It used in episode 30, 38, 53 and 54 (as an excerpt)

The full process of attack perfoming is shown in episode 30:
Hissatsu Ichimonji Fire

Hissatsu Ichimonji Fire

Hissatsu: Ichi Monji Faiaa