A peaceful world 35 years after the Great War between Raiden and the demons. The town where Akira Kuzuki, an ordinary middle school student, lives is destroyed by a fossilized beast that suddenly appears. At that moment, Akira hears a voice from Kou Hibiki, who was piloting Raiden. "Ride Raiden in my place"... Meanwhile, Prince Sharkin, who once fought and lost against Kou, has also been revived. The ancient giant god is revived and the girl's battle begins!!