He possesses Kayo and causes her to kill her own comrades at Iga. He has blue hair, and comes out of Kayo's back. Is killed by Ryoma. His most powerful ability is to cause the instantaneous explosion of enemies heads.

The year a comet races across the sky, splitting the heavens, from the depths of the Earth the dark god shall arise once again. Then, the dark evil lurking in the shadows shall come out of the depths of Hell and show itself in the present world. The emotions of the blade of the wind shall collect at the source of the blue light. And the three blades shall become one, vanquishing evil. 
The year is 1580, and the unholy armies of Lord Nobunaga Oda steadily spread across Japan. Narrowly escaping the slaughter of her clan, a young ninja steals into the shadows. She is Ayame, the last of the Kasumi clan, and the dagger she wields is one of three, mystical blades. She is joined by Sakon and Ryoma, renegade ninja and the possessors of the sacred sword and spear. Now, these shadow warriors must unite their weapons and skills to fulfill `The Prophesy of the Enchanted Swords` or die trying... 
This is a cut version of the earlier OVA. 
(Source: AniDB)

__Birth name:__ Reijirou Nomoto (野本礼次郎)

In the year 1580, a man named Lord Nobunaga Oda sends hoards of unholy armies across Japan, slaying all who stand in their way. A young ninja escapes her villages' destruction with a short sword, one of the three mystical weapons that can end Oda's rule. During her quest, she is joined by two other ninjas who wield the other two weapons of legend, the sacred sword and spear. 
(Source: Anime News Network)

Masago