Kohtaro Kuga (玖珂 光太郎) is the main protagonist of the Shikigami no Shiro series, appearing in every installment in the series to date. His shikigami was once a woman named Sazae, but in Shikigami No Shiro III, his shikigami is now Sayo Yuuki. He has an older brother known as Shintaro Kuga.
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