Kirigakure Saizou is one of the Sanada Jyuuyuushi and also a very good ninja. He has been devoted to Yukimura since his childhood, and will even turn against other members of the Sanada clan to protect his master. He has even been critically injured defending Yukimura in battle.  Despite his devotion to Yukimura, Saizo is often exasperated by his master's casual attitude and often worries about him. But he respects and fears Yukimura's abilities and ultimately will do anything he says, and his selfless devotion has also earned Yukimura's respect and caring.

At the dawn of the 17th century, at the end of the era of civil wars, in a world of chaos, the epic Battle of Sekigahara was joined. One man emerged from the largest battle ever fought on Japanese soil; a terrible warrior of unspeakable power, he was nicknamed 'the unconquerable.' 
Kyoshiro is a peaceful medicine peddler who harbors the soul of an assassin. He accompanies a young bounty hunter across Japan in search of a murderer and on a quest to discover the terrible secret of his own identity. (Source: Tokyopop) 
 
Volume 38 contains the side story "'Michi' no Tochuu" (「道」の途中).

In the year 1600, during the battle of Sekigahara, warriors Kyoshiro Mibu and "Demon Eyes" Kyo - the legendary slayer of a thousand men - engaged in fierce combat. Both men disappeared when a meteor crashed in the battlegrounds. Four years later, Kyoshiro is spotted on a rural highway, acting as a traveling medicine salesman. He is captured by the female bounty hunter Yuya Shiina when she discovers that deep inside him is the dormant personality of "Demon Eyes" Kyo himself.
 
(Source: Anime News Network)

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Gianluca Iacono is an Italian voice actor who contributes to voicing characters in movies, cartoons, anime and more content.
Iacono is well known for voicing Vegeta in the Italian version of Dragon Ball Z, Dragon Ball GT, Dragon Ball Super and Roy Mustang in Fullmetal Alchemist.
Between 2010 and 2011, he temporarily replaced Claudio Moneta as the voice of Kakashi Hatake in Naruto: Shippuden.
Iacono currently works at Deneb Film, Studio P.V., Merak Film, Studio ASCI and other dubbing studios in Italy. 

Saizou Kirigakure