Daigo, who teaches the children who are the future Demon Knight, is visited by his brother Seiji Hinoha (Hiroyuki Takashima).

Daigo and Seiji are happy to see each other again. Meanwhile, the training ground is attacked and the children are eaten by a horror.

Ryuga and Rian chase the horror and arrive at Daigo's training ground.

A mysterious man, Woska (Funaki Masakatsu), also shows up at the training ground.

Leaving the injured Daigo behind, Ryuga, Rian, Lume and Gardo head for Ladan. Sitting on a throne, Jinga finally brings the legendary Radan Castle back to life in the present day. The Radan Castle contains a terrifying ability that will drive mankind to despair.