Yun Kōga

"When his beloved older brother is brutally murdered, Ritsuka is heartbroken but determined to search for 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"--Cover.

When 12-year-old Ritsuka discovers a message from his brother Seimei that he was murdered, Ritsuka joins forces with Soubi to find Seimei's killer and uncover the truth.