"Ai City" is a science fiction manga and anime series created by Yūichi Hasegawa, originally serialized in 1986. The narrative is set in a dystopian future where humanity is on the brink of collapse due to environmental devastation and societal decay. The story revolves around Aiko, a young girl with mysterious psychic abilities, and her protector, Shunsuke Kishi, a former soldier with a tragic past. Together, they navigate a dangerous world filled with rogue factions, government conspiracies, and supernatural forces.

Aiko's powers make her a target for various groups seeking to exploit her abilities. The most prominent of these is the enigmatic organization known as the "Ai System," which aims to use her to control the remnants of civilization. Shunsuke, driven by a sense of duty and guilt, becomes Aiko's guardian, determined to shield her from those who would harm her. Their journey takes them through a decaying urban landscape, where they encounter allies and enemies, including other psychic individuals and remnants of the old world's military.

The plot delves into themes of survival, morality, and the consequences of unchecked technological advancement. Aiko's powers are central to the narrative, as they represent both hope and destruction, depending on who wields them. The series explores the ethical dilemmas surrounding the use of such abilities, as well as the personal struggles of its characters. Shunsuke's internal conflict, torn between his violent past and his desire to protect Aiko, adds depth to the story, while Aiko's innocence and vulnerability highlight the human cost of the world's collapse.

The setting of "Ai City" is a bleak, post-apocalyptic world where the remnants of humanity struggle to survive amidst the ruins of advanced technology. The city itself is a character, with its crumbling infrastructure and oppressive atmosphere reflecting the themes of decay and desperation. The series blends elements of cyberpunk and supernatural fiction, creating a unique tone that combines action, suspense, and philosophical inquiry.

The anime adaptation, released in 1986, closely follows the manga's storyline, capturing its dark and atmospheric tone. Both versions of "Ai City" are notable for their intricate world-building and complex characters, offering a thought-provoking exploration of a future where humanity's survival hinges on the choices of a few individuals. The series remains a significant work in the science fiction genre, remembered for its compelling narrative and distinctive vision of a dystopian future.