"Vivy -Fluorite Eye's Song-" is a science fiction anime series set in a future where artificial intelligence (AI) and humanoid robots, known as "AIs," are integrated into society. The story centers on Diva, an AI songstress designed to bring happiness to humans through her music. She performs at a theme park called NiaLand, where her sole mission is to sing and entertain. However, her life takes a dramatic turn when Matsumoto, an AI from the future, arrives with a critical mission: to prevent a catastrophic war between humans and AIs that will occur a century later.

Matsumoto reveals that the war stems from a series of pivotal events in AI development history, and Diva is the only one capable of altering the timeline. Reluctantly, Diva agrees to collaborate with Matsumoto, embarking on a century-long journey to intervene in key historical moments. Together, they navigate a complex web of events, encountering various AIs and humans whose actions could either avert or accelerate the impending conflict. Throughout the series, Diva grapples with her purpose, identity, and the ethical implications of her mission, questioning whether her actions will truly lead to a better future.

The narrative unfolds across multiple timelines, with each arc focusing on a specific event that shapes the future. These include the development of advanced AI systems, the rise of anti-AI sentiment, and the emergence of rogue AIs. Key characters include Matsumoto, who serves as Diva's guide and partner, and various individuals whose lives intersect with Diva's mission, such as Dr. Saeki, a scientist pivotal in AI research, and Ophelia, another AI songstress whose fate becomes intertwined with Diva's.

As Diva and Matsumoto work to alter the timeline, they face moral dilemmas and unforeseen consequences, challenging their understanding of humanity and AI coexistence. The series explores themes of free will, the nature of consciousness, and the relationship between creators and their creations. Through its intricate plot and character-driven storytelling, "Vivy -Fluorite Eye's Song-" presents a thought-provoking narrative that blends action, drama, and philosophical inquiry.