"Iczer Reborn" is a six-episode OVA series that serves as a sequel to the original "Iczer-1" anime. The story is set in a futuristic world where humanity faces an existential threat from an alien force known as the Cthulhu. The Cthulhu are a malevolent race seeking to dominate and destroy all life forms, particularly targeting Earth. The narrative centers on Nagisa Kano, a young woman who becomes the chosen partner of Iczer Robo, a powerful mecha piloted by the warrior Iczer-2. Together, they must combat the Cthulhu and protect humanity from annihilation.

Nagisa is initially reluctant to accept her role as Iczer-2's partner, struggling with fear and self-doubt. However, as the battles intensify, she gradually embraces her destiny, forming a deep bond with Iczer-2. Their partnership is crucial, as Iczer Robo requires both pilots to function at full strength. The series explores themes of courage, trust, and the resilience of the human spirit in the face of overwhelming odds.

The antagonist, Big Gold, is a high-ranking Cthulhu commander who orchestrates the invasion of Earth. Big Gold's relentless pursuit of destruction and her disdain for humanity drive much of the conflict. The series also introduces other key characters, such as Iczer-1, the original Iczer warrior, who plays a pivotal role in the final battles. The dynamic between Iczer-1 and Iczer-2 adds depth to the narrative, highlighting the legacy of the Iczer lineage and their shared mission to protect the universe.

The plot unfolds through a series of intense mecha battles, interspersed with moments of character development and emotional tension. The stakes escalate as the Cthulhu deploy increasingly powerful forces, culminating in a climactic showdown that tests the limits of Nagisa and Iczer-2's partnership. The series balances action with introspective moments, delving into the psychological and emotional struggles of its characters as they confront their fears and responsibilities.

"Iczer Reborn" is a continuation of the Iczer saga, expanding on the lore and themes established in the original series. It maintains a focus on the bond between humans and their alien allies, emphasizing the importance of unity and determination in the face of existential threats. The narrative is driven by its central conflict, with the fate of Earth hanging in the balance as the characters fight to preserve their world and their future.