Suzu is a 17-year-old high-school student living in a rural town with her father. Wounded by the loss of her mother at a young age, Suzu one day discovers the massive online world "U" and dives into this alternate reality as her avatar, Belle. Before long, all of U's eyes are fixed on Belle, when, suddenly, a mysterious, dragon-like figure appears before her.
When his family is murdered, a deaf-mute named Boy escapes to the jungle and is trained by a mysterious shaman to repress his childish imagination and become an instrument of death.
The story follows the coming of age and Shinki battles of Tsubasa, a boy who dreams of becoming a Shinki Master, and his Shinki partner Arnval Mk. 2.
