"Kikō Heidan J-Phoenix: PF Lips Shōtai" is a science fiction anime series set in a futuristic world where humanity faces threats from advanced alien technology. The story centers around the J-Phoenix, a specialized military unit tasked with defending Earth against extraterrestrial forces. The team operates advanced mecha known as Powered Frames, which are piloted by skilled soldiers. The narrative unfolds as the J-Phoenix unit confronts a series of escalating alien attacks, each more sophisticated and dangerous than the last.

The main characters include the unit's leader, Captain Ryuichi Hayami, a seasoned and strategic commander who balances his duty with a deep sense of responsibility for his team. Alongside him is Lieutenant Aya Fujisaki, a skilled pilot with a strong sense of justice and a personal vendetta against the alien invaders. The team also features rookie pilot Kenji Takashiro, whose growth and development form a key subplot as he learns to harness his potential and contribute to the unit's missions. Other members include the technical expert, Sergeant Makoto Tachibana, who ensures the Powered Frames are battle-ready, and the intelligence officer, Lieutenant Yuki Saegusa, who provides critical information and tactical support.

The plot progresses through a series of missions, each revealing more about the alien threat and their ultimate objectives. The aliens, known as the Zephyrians, possess advanced technology and a mysterious connection to Earth's past, which becomes a focal point as the J-Phoenix uncovers hidden truths about their origins. The series explores themes of teamwork, sacrifice, and the moral complexities of warfare, as the characters grapple with the consequences of their actions and the toll of constant battle.

As the conflict intensifies, the J-Phoenix unit faces internal challenges, including personal conflicts and the strain of their responsibilities. The narrative builds toward a climactic confrontation with the Zephyrian leadership, where the fate of Earth hangs in the balance. The series concludes with a resolution that ties together the central plotlines while leaving room for reflection on the broader implications of humanity's struggle against extraterrestrial forces.