Moopy, a cosmic creature that gives pleasure directly to the human brain. Masato, who has fallen in love with Moopy, whose possession is prohibited, escapes from Moopy's Tamami and the underground city of Yamato, and reaches Dr. Saruta, an authority on artificial life who lives a seclusion on the surface. Rock, who has been chasing Masato, arrives at the laboratory, and a full-scale war between underground cities around the world breaks out, and humanity is destroyed, leaving only three people. Dr. Saruta and Rock also die, leaving behind Masato, who has become an immortal body due to the Phoenix, and Moopy's Tamami, who was originally strong in vitality.