13-year-old Mai Su lives with her mother Molly in Grainland. When Mai was young, her father left home: that, his later death, and Molly subsequently becoming emotionally dependent on robots, causes Mai to feel left out and develop a hatred and annoyance for robots and robotic technology. In the present, Molly and Mai attend a product launch at the IQ Robotics headquarters. Annoyed by Molly, Mai wanders off, stumbling into a secret lab owned by Dr. Tanner Rice, who has been working on an offensive robot called 7723. Mai accidentally activates 7723, before being apprehended by security and returned to her mother at the launch, where Justin Pin, CEO of IQ Robotics, reveals a new generation of Q-Bots to the public, but secretly designed them to explode on command. 7723 leaves the lab to find Mai, but is pursued by law enforcement, fighting them until he falls to the lowest levels of the city, damaging his memory core. While going to check on her dog Momo, Mai finds 7723 in her backyard, and after seeing his weapons system, she lets him stay in the shed, using him and his weaponry to intimidate a group of bullies led by Greenwood, before embarking with 7723 on shenanigans throughout the city, forming a tentative friendship. As 7723 accumulates more memories, he struggles to decide which to keep. When Mai confronts him, he reveals if he reaches full capacity, he will undergo a
total reset that will delete them all. Mai suggests deleting his core systems to make room, but 7723 warns that he would lose functionality despite gaining storage. 7723 becomes apprehensive about using his abilities under Mai's orders, after she angrily orders him to kill Greenwood, which he refuses. Angered by Greenwood failing to understand why she's even upset with her, Mai hits Greenwood with her baseball bat, until Greenwood begins to cry, snapping Mai out of her anger. 7723 subsequently deletes his weapon system to save his memories and prevent himself from hurting others, and promises to never let Mai down again. 7723 unknowingly gets spotted by Molly's Q-Bot, allowing Dr. Rice to find him. Rice goes to Mai's house to
format 7723's memory and take him away, explaining that he built 7723 to prevent an upcoming crisis. Pin arrives, and Rice’s appeal prompts Pin to announce his plan to kill all humanity. Without his weapons, 7723 struggles to fight Pin and his bodyguard robot Ares who kidnaps Molly, before 7723 flees with Mai and Momo into the sewers. Rushing to IQ Robotics to rescue Molly, Mai is quickly apprehended, but 7723 arrives and they make up. They find Dr. Rice, who warns them of Ares, before Pin kills him. Mai notices that Pin's mannerisms are mimicking Ares', and after the resulting fight is taken to a nearby sports stadium, the truth is eventually and publicly revealed: Ares had killed Pin and used a bionic skeleton in his body. Pin once told Ares to make the world "perfect," which Ares believes will only happen through humanity's extinction. With his plans exposed, Ares begins detonating the Q-Bots and merges with a powerful assault armour to overpower 7723. Mai rescues Molly and evacuates the stadium, but is captured by Ares' Pin body. Severely damaged and unable to fight Ares, 7723 initiates a total reset to restore his weapons and save Mai. With his memory now gradually being deleted, he shares one last goodbye with Mai before battling Ares. 7723 manages to fatally damage Ares' main body, but his reset completes, becoming inert. A weakened Ares attempts to shoot the now-vulnerable 7723 through his Pin body. However, Momo distracts him, allowing Mai to decapitate Ares' main body, deactivating both it and Pin. 7723 re-activates but fails to recognize Mai. Mai re-teaches 7723 the pleasures of life and steers him in the right direction, allowing him to gradually start to regain his old memories. She befriends classmate Ani, Greenwood and her former bullies, having reconciled with her mother and made peace with her past. As Mai plays soccer with her friends, she invites 7723 to join them. ==Voice cast==