Synopsis

As a child, Ryuhei looked up to his older brother but watched him perish in a mysterious incident right before his eyes. Now a high schooler, Ryuhei shows no outward signs of the trauma of that nightmarish incident and spends most of his leisure time kickboxing. One day, while kickboxing, he encounters a creature that calls itself Tris, and is bitten by it, resulting in him having a strange dream. [ANN]