A future where humanity and android coexist. Androids are destined to be distinguished from humans by the barcodes engraved on their bodies and the eyelids that never close, and to be disposed of when their activity expires. Also, in order to deter the rapidly increasing number of android-related crimes, police officers were granted the "right to shoot" to allow them to punish androids on the spot as needed.

Police officer No. 36, who belongs to the "Machine Crime Division" in District T, is unsure if he is doing the right thing. He feels guilty every time he disposes of an android. Meanwhile, in a battle with an android advocacy group, he finds a "human" in the android of a girl who is cornered and trying to self-destruct. At the moment of shooting the gun, No. 36 witnesses the girl moving her eyelids, which should not move. He suffers a mental breakdown.

It was the song of Karen, the singer of the music bar , what saved No. 36. He was ordered to take leave from work. A mysterious series of android destruction occurs before No. 36. He was able to return to work inspired by the power of her song. No. 36, who realized that the target was the singer androids, contacts a group called "Maria's Day". Meanwhile, Karen, who was selected as a "candidate" for "Maria's Day," is attacked by androids who have no barcode on their bodies.

No. 36 is proceeding with an independent investigation, but...