Kurose came from the modern day world. Kurose is plunged into darkness. The god of darkness, Tokoyami, places Kurose in another world where Kurose gets a measure of peace. Unfortunately, war with a neighboring country causes Kurose to lose the person he cares about.
Kurose and the god of darkness, Tokoyami, conspire to take control of the emperor of Naga’s throne. They have no qualms about using Asahi to do it. Worried for Asahi’s safety, the water dragon god decides it’s best to return her to her former world. But Asahi does not want to return to the modern world without people she cares about.