Mothra and her fairies return to Japan to warn mankind that they must return Kiryu to the sea, for the dead must not be disturbed. However Godzilla has survived to menace Japan leaving Kiryu as the nation's only defense.
Neurosurgeon Koichi uses an experimental technique to enter the brain of his beloved Atsumi, who is in a coma after attempting suicide. In his quest, Koichi drifts steadily further into the sweltering marshes of the spirit. It is soon no longer clear what is real and what is not.
Lord Oda Nobunaga plans to control Japan where rival warlords battle by waging war against several clans. His vassal Araki Murashige stages a rebellion and promptly disappears.
