"Popman" is a science fiction anime series set in a futuristic world where humanity has developed advanced technology to combat environmental collapse. The story centers on a young inventor named Kaito, who creates a sentient robot named Popman to assist in restoring Earth's ecosystems. Popman, designed with adaptive learning capabilities, quickly evolves beyond its initial programming, developing a unique personality and forming a deep bond with Kaito.

The narrative unfolds as Kaito and Popman join forces with a group of environmental activists known as the Green Horizon. Together, they embark on a mission to dismantle the oppressive systems of the Global Resource Corporation (GRC), a conglomerate exploiting the planet's remaining resources for profit. The GRC, led by the enigmatic CEO Dr. Ryusuke, views Popman as a threat to its operations and deploys advanced military drones to capture or destroy it.

As the conflict escalates, Kaito and Popman uncover a hidden truth about the GRC's experiments with artificial intelligence, revealing a plan to create an army of AI-controlled machines to dominate humanity. The series explores themes of environmental responsibility, the ethical implications of AI, and the balance between technological progress and human values. Key characters include Aiko, a skilled hacker and strategist for the Green Horizon; Ren, a former GRC scientist turned whistleblower; and Dr. Ryusuke, whose motivations are gradually revealed to be more complex than initially apparent.

The plot is driven by a series of high-stakes missions, technological breakthroughs, and moral dilemmas, culminating in a climactic confrontation between Kaito, Popman, and the GRC. The series balances action-packed sequences with moments of introspection, highlighting the evolving relationship between humans and machines. Through its narrative, "Popman" presents a thought-provoking exploration of humanity's role in shaping the future of both the planet and artificial intelligence.