Follows Rouge, an android girl, who is on a mission on Mars with her partner Naomi. The mission is to murder Immortal Nine, nine artificial humans who are hostile to the government.

Follows Yuta who repeatedly drew and then erased Gridman in his notebook, which he vaguely remembers. Then he decided to confess his feelings to Rikka, and their life in such a peaceful world begins to crumble with a roar.

Brought together by a mysterious song, a grad student and an engineer lead the fight against an unimaginable force that may spell doom for the world.