After successfully saving Ryume and stopping Agō, Ryuga and Rian are assigned under her as guardians of Line City as they investigate a mysterious increase in Horror activity in the area. This is all a plot by fallen Makai Knight Jinga and his wife Makai Priestess Amily, who have since become Horrors years ago as a result of giving into his darkness following the death of their son, to raise the ancient weapon Radan to destroy humanity. To stop them, Ryuga and Rian team up with Daigo Akizuki, Giga the Beast Knight, and the Makai Priests Gald and Haruna, as well as D Ringo and Yukihime before the two Horrors can succeed in their plans.