Kimi Ga Eiyuu Ni Naru Monogatari

Shudo Shrine in Osaka is a venerable shrine devoted to the deity Abe no Seimei. "The Book of Abe no Seimei" has been carefully enshrined there for generations. The eldest son of the shrine, Shudo Narumi, made a contract with this scroll to become the only man who can control the power of "Abe no Seimei". In the wake of an incident at Osaka Castle, a battle for the scroll broke out... A "heroic" battle fantasy unfolds in Osaka.

(Source: Mag Garden, translated)