"Housing Complex C" is a four-episode anime series that blends elements of mystery, horror, and psychological tension. The story is set in a small, secluded housing complex located in a coastal town. The protagonist, Kimi Shirokado, is a young girl who lives in the complex with her parents. Kimi is observant and curious, often noticing peculiarities in her surroundings that others overlook. The narrative begins with a sense of unease as strange occurrences and unsettling rumors about the complex start to surface.

The housing complex itself is a microcosm of diverse residents, each with their own secrets and quirks. Among them are Yuri Koshide, a mysterious woman who seems to know more than she lets on, and Taka, a local fisherman who becomes increasingly involved in the unfolding events. The series gradually reveals a dark history tied to the complex, involving ancient rituals, supernatural forces, and a series of unexplained disappearances. As Kimi delves deeper into the mysteries, she uncovers connections between the complex's past and the eerie events plaguing its present.

The plot intensifies as the residents' lives become entangled in a web of paranoia and fear. Strange symbols, cryptic messages, and bizarre phenomena suggest that the complex is a focal point for something far more sinister than mere coincidence. The tension escalates with each episode, culminating in a climactic revelation that ties together the supernatural elements and the psychological struggles of the characters. The series maintains a steady pace, balancing character development with the gradual unraveling of its central mystery.

Kimi's role as the central figure is pivotal, as her perspective drives the narrative forward. Her interactions with the other residents, particularly Yuri and Taka, provide insight into the complex's hidden layers. The supporting cast, including Kimi's parents and other neighbors, adds depth to the story, each contributing to the overarching sense of dread and intrigue. The series concludes with a resolution that leaves certain elements open to interpretation, emphasizing the lingering impact of the complex's dark legacy on its inhabitants.