A tiny human explorer named Yakone travels across a dying planet alongside her two companions: Yago, a large, hamster-like creature, and Ney, a round, loyal drone. Their world is being consumed and reshaped by a mysterious red fog, a phenomenon that has already led to the extinction of human civilization. Strange, triangular-headed entities oversee this transformation, which alters all living things into bizarre and often dangerous creatures not normally found in this world. Despite the desolate and ever-shifting landscape, Yakone and her friends journey onward, discovering pockets of joy and wonder in crumbling ruins, shared meals, and quiet companionship.

The central conflict arises from navigating this hostile but fascinating environment, where the very nature of reality is in flux. The group's primary motivation is not just survival but the pursuit of discovery itself. Yakone is driven by a more specific goal: following the clues left behind in her father’s notebook. These clues guide the trio toward a mysterious location known as the Kanrikyoku, an uneasy place where echoes of the past still linger. The narrative explores profound themes of loneliness, loss, and survival, while also delving into the complexities of racial acceptance in a world where all former rules have been broken.

One notable narrative arc begins with the introduction of a peculiar girl named Ruru. Her arrival brings both warmth and confusion, and she reminds Yakone of a simple comfort she had long forgotten: the feeling of being called by name. As their bond grows, so does Yakone’s sense of purpose in a fading world. The overarching plot is structured around a clear main conflict and crisis, with several obstacles for the protagonist to overcome. The story weaves these challenges into a compelling whole, mixing post-apocalyptic drama with slice-of-life moments to create a hopeful portrait painted against a backdrop of decay.