"Nekojiru Gekijō" is a surreal and darkly whimsical anime series based on the manga by Nekojiru (Yumiko Ooshima). The narrative centers on two anthropomorphic cat siblings, Nekojiru and her younger brother Nyatta, as they navigate a bizarre and often unsettling world. The series is episodic, with each episode presenting self-contained stories that blend absurd humor, dreamlike logic, and moments of profound melancholy.

Nekojiru, the older sister, is often portrayed as brash and domineering, while Nyatta is more naive and innocent. Their interactions range from playful sibling rivalry to moments of genuine care, though their relationship is frequently tested by the strange and often dangerous situations they encounter. The siblings' adventures take them through a variety of surreal landscapes, from mundane domestic settings to fantastical realms filled with grotesque creatures and inexplicable phenomena.

The tone of the series shifts unpredictably, blending slapstick comedy with dark, sometimes disturbing themes. Episodes often explore existential questions, societal critiques, and the fragility of life, all conveyed through the lens of the siblings' misadventures. For example, one episode might depict Nekojiru and Nyatta engaging in a lighthearted competition, while another might delve into themes of loss, transformation, or the consequences of greed.

Recurring motifs include transformation, mortality, and the absurdity of existence. Characters frequently undergo bizarre physical changes, such as turning into inanimate objects or merging with other beings, often with tragic or ironic outcomes. The series also features a cast of eccentric supporting characters, including anthropomorphic animals, spirits, and humans, who contribute to the chaotic and unpredictable nature of the world.

Despite its whimsical presentation, "Nekojiru Gekijō" is marked by an undercurrent of melancholy and existential dread. The series does not shy away from depicting the darker aspects of life, including death, abandonment, and the inevitability of change. This juxtaposition of humor and tragedy creates a unique and unsettling viewing experience, challenging conventional storytelling norms and leaving a lasting impression on its audience.