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Spiral The Bonds of Reasoning Vol 1 by Kyo Shirodaira. A Mystery manga rated Teen, published in English by Yen Press in 2007.
High schooler Ayumu Narumi has always lived in the shadow of his brilliant older brother, a detective who disappeared without a trace. When he's pulled into a series of mysteries surrounding the enigmatic Blade Children, he starts to uncover what happened. A clever mystery thriller.