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.

Soubi leads Ritsuka through a maze of new experiences, from battles wrought in wordplay to making friends at school. But is he any less alone with the secretive Soubi than by himself?