Kaoru was formerly a member of Kurei's Uruha, but he later joins Recca's team in the Ura Butō Satsujin. He uses the Kōgan Anki, a puzzle-like weapon with five distinct forms. In the manga, the weapon also possesses a mysterious sixth form: "Mu" (Nothing).
Spoiler
At the series end, he follows Kuurei to the past forever leaving his friends.
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