In a world where certain humans command mighty supernatural duos called Daemons, it is the birthright of "the children who sunder day and night"-twins Yuru and Asa-to rule over these powerful entities. Yuru's somber thoughts about Asa's past are broken by Dera, who suddenly arrives at the manor. Though a tense debate about the twins unfolds, it's Yuru who has the last word: a brash declaration to all hostiles! As he leaves the Kagemoris behind for Dera's secret lair, however, a vicious pair of Daemons lies in wait. Left and Right must take on a primal evil to keep their master alive!