The story revolves around the members of a private military company (PMC), and the uneasy tension between them and the regular military after a war that caused massive environmental destruction. (Source: Animekon)

044 becomes the strongest female soldier excelling in combat through gene manipulation using a virus. However, in exchange for her abilities, her days become numbered. The next mission of the government is to destroy a bloodthirsty squad, Phage, and its leader King. In her battle, she encounters a Phage soldier, Luka, and finds herself unable to kill him. She wonders why, but as a result, Daxus Jr., the leader of the government group, regards her as a traitor. She is targeted by both Phage and the government, and she runs away with the injured Luka. (Source: ANN)

At the Ministry of Science, fervent Professor Ochanomizu alongside his coworkers strive to reactivate Atom—the first robot with a human heart. Atom is the masterpiece of enigmatic Professor Umatarou Tenma, who built the android to replace his deceased son Tobio. However, while Tenma inexplicably shut down his brainchild and disappeared, Ochanomizu refuses to let such a major breakthrough in science go to waste. Despite having the appearance of a nine-year-old, Atom not only possesses incredible strength and intelligence, but he is also endowed with a remarkable conscience and compassion that rivals humans. Sadly, the mechanical boy soon faces rejection and learns that not everyone is as welcoming as Ochanomizu. Although automatons have integrated into society, they are accepted only as tools and even seen as an upcoming threat to mankind's dominion. Dreaming of a world where people and robots can prosper together, Atom dedicates his existence to protecting the lives of both and inspiring them to form genuine bonds.