Kaoru was once a member of Kurei's Uruha, but later, he becomes a member of Recca's team in the Ura Butō Satsujin. He wields the Kōgan Anki, a puzzle-like weapon that has five different forms. In the manga, the weapon also has a mysterious sixth form: 'Mu' (Nothing). At the series end, he follows Kuurei to the past forever leaving his friends.

Recca Hanabishi is a ninja, but is nearly killed in an accident. However, a girl named Yanagi heals him with her powers. Later, the two are tracked down by a woman who attacks them. She tells Recca to ignite his flame, but he is clueless. Just as she hurts Yanagi, Recca releases a powerful flame upon the woman. She is excited to see this. It turns out that Recca was a baby, from the Hokage Clan of the past, that was sent to the future in order to escape death. Now, Recca is the leader of the new Hokage Clan who must stop his half brother, Kurei, from kidnapping Yanagi.<br><br>
(Source: AniDB)

Skills & Abilities: Plays the piano

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Becoming a ninja is just a childhood dream for sixteen-year-old Recca, until a fateful encounter reveals he has inherited ninja powers, including the ability to wield fire! As Recca learns to master the ancient ways of his ancestors, he is drawn to protect a mysterious girl named Yanagi...
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(Source: Viz Media)

Kaoru Koganei