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. After a fierce scuffle against Long-Arm and Long-Leg, Yuru meets their timid master, Ken-who happens to be Dera's half brother! Ken reveals that his father had helped Yuru's parents go into hiding, prompting Dera to contact a shady shaman for more intel on the previous Tadera clan head. Meanwhile, another tragedy is about to befall Higashi Village, courtesy of a swordsman named Ivan Yosano...