After Armageddon Gaiden: Maj? T?sh?den Eclipse is a side story to Last Armageddon. Because of the release of the Saturn this title was never brought outside Japan. Like Last Armageddon, this game is a turn-based RPG in which the player controls a group of demons in a post apocalyptic world.

The story takes place in the future, hundreds of years after the extinction of mankind due to a nuclear holocaust. Demons are the rulers of the planet now, but they are engaged in battle for the dominion of the earth by some aliens/robots. The gameplay is similar to Final Fantasy and nearly identical to Last Armageddon. Battles are turn based and, like in Last Armageddon, blocking prevents all the damage from the enemy.