Also known as: 佐藤啓作
Series: Shakugan No Shana
An ordinary high-schooler, best friends with Tanaka Eita; their life changes when Margery Daw enlists them as assistants. They quickly become her most loyal allies. Unlike Eita, who's torn between the Flame Haze world and his girlfriend, Keisaku has found his calling and is firmly dedicated to Margery.