In a world of shapeshifting ravens, Yukiya, a Northern leader's son, is summoned by the Imperial Prince as murder, mysteries and an invasion from an unknown enemy threaten the four noble regions.

The story is set in an alternate world called Yamauchi, ruled by the Yatagarasu clan, who are able to transform between human and crow forms. Yukiya, a beautiful and eccentric Yatagarasu boy, is chosen to serve the young prince. While encountering various events in the conspiracy-filled imperial court, he forms a strange master-servant relationship with the young prince.—MAL News

Welcome to Yamauchi, a world inhabited by the Yatagarasu, a race of three-legged ravens who shapeshift into humans. The land is divided into four regions-North, South, East, and West-each ruled by a noble family. Yukiya, the son of a leader in the North, is shocked by a call to attend to the Imperial Prince. Murder, mysteries, and an invasion from an unexpected enemy await in this epic fantasy.—Crunchyroll