Nora is a white Nyanvy, an artificial lifeform with an elongated body blending feline and weasel traits. She roams as a stray until discovering the Cat of Cats tournament flyer, promising a year's food supply to the victor, which spurs her participation.

Demonstrating natural combat skill early on by defeating a rival Nyanvy on a playground, Nora attracts Aoi, a human inventor and groomer who becomes her guide. Advancing through the tournament ranks, Nora employs a distinct physics-driven wrestling style, primarily using forceful butt-slams and aerial launches to knock opponents off stages. She consumes energy drinks ("juice") to enter a temporary Berserk state, boosting her speed and attack power.

Progressing further, Nora confronts organized crime, defeating a mob boss. This victory reveals a larger conspiracy: the tournament is orchestrated by the EBE, rabbit-like aliens opposing individuality. The EBE, creators of the Nyanvies, intend to use the winner as a blueprint for mass production, eliminating all other Nyanvies to enforce uniformity. This discovery transforms Nora's objective from personal gain to protective action. She allies with Aoi to oppose the EBE and their penguin forces, undertaking missions to rescue captured Nyanvies.

Beyond combat, Nora engages in stealth operations and puzzle-solving during her campaign. She collects coins exchangeable for extensive physical customizations, including fur color, patterns, facial expressions, eye shapes, ear types, tail designs (like bunny or raccoon tails), and accessories such as hats or helmets. Her vocalizations also feature adjustable effects like raccoon sounds, snorts, or robotic tones.

Nora forms fluid alliances, capable of temporary partnerships with other competitors mid-battle despite the battle royale format, showcasing her adaptability. Her journey concludes with her defending Nyanvy individuality against existential threats.