"Kigurumikku V3" is a science fiction anime series set in a near-future world where advanced technology and artificial intelligence have become integral to society. The narrative centers around a group of individuals who pilot specialized mecha suits known as Kigurumikku, designed to combat a mysterious and highly destructive force called the "Eclipsers." These entities emerge from an alternate dimension, threatening the stability of the world. The story explores themes of identity, humanity, and the ethical implications of technological advancement.

The protagonist, Haruto Soma, is a young engineer recruited by a clandestine organization known as the Kigurumikku Development Bureau. Haruto is tasked with piloting the experimental V3 unit, a cutting-edge Kigurumikku model with unique capabilities. Alongside him are other pilots, each with their own motivations and backstories, including Rei Ayanami, a stoic and enigmatic figure with a mysterious connection to the Eclipsers, and Kaito Tachibana, a hot-headed but skilled pilot driven by a personal vendetta.

As the series progresses, the pilots uncover the origins of the Eclipsers, revealing a complex web of scientific experimentation and interdimensional manipulation. The narrative delves into the moral dilemmas faced by the characters, particularly regarding the use of AI and the potential consequences of their actions. The story is punctuated by intense mecha battles, strategic planning, and moments of introspection as the characters grapple with their roles in the conflict.

The plot is structured around a series of escalating confrontations with the Eclipsers, interspersed with character-driven subplots that explore the personal struggles and relationships of the pilots. The series balances action with philosophical inquiry, raising questions about the nature of consciousness and the boundaries between man and machine. The climax involves a high-stakes mission to close the dimensional rift, culminating in a resolution that leaves lasting implications for the world and its inhabitants.