Ritsuka Aoyagi is alone in the world--never fitting in at school and alienated from his own past by a fragmented memory. When his beloved older brother is brutally murdered, Ritsuka is heartbroken but determined to find answers. His only lead is Soubi, a mysterious, handsome college student who offers him an intimate link to his brother's other life: a dark and vibrant world of spell battles and secret names.

With Soubi coerced back into his relationship with Seimei and now missing, Ritsuka becomes determined to reclaim the strange man who changed his life from the brother he once adored. Meanwhile, Nagisa reveals information about the past of Seven Voices Academy and the painful origins of old loves lost.