プロローグは終末で

For over twenty years, the Professor secluded himself underground, fueled by a desire for revenge against humanity. Finally, he completed his ultimate humanoid weapon: Unit A-00GR. However, when they finally emerged onto the surface, the world had already been destroyed—. Amidst the ruins of civilization, Unit A-00GR and the Professor embark on a journey to rediscover the 'emotions' of mankind.