In the peaceful residential neighborhood of White Chalk Town, or Hakuachō, small dinosaur babies suddenly appear one day without explanation. Rather than causing panic, the town's residents quietly accept the tiny creatures into their homes and daily routines, treating them as beloved family members. The story centers on Kurata, a single office worker living alone, who returns from work one evening to find a baby Triceratops sitting at her doorstep. She takes the dinosaur in, names it Babu, and gradually adjusts to a life that now includes morning walks, shared meals, bath time, and the small, warm moments that come with caring for a childlike creature.

Other dinosaur characters join the growing community, each with distinct personalities: Nikko is cheerful and playful, Dacco is affectionate and sleepy, Kabosu is mischievous, and later additions such as Komachi and Shiba bring further variety to the cast. The humans of White Chalk Town are equally varied, forming a supportive network that treats the dinosaurs like an extended family. The manga is told in a gentle four-panel comic format, emphasizing humor, tenderness, and the quiet beauty of everyday life.

Beneath the surface of this cozy slice-of-life narrative lies a deeper origin story. The dinosaurs are revealed to have come from the Cretaceous period, having taken refuge in a cave during the catastrophic asteroid impact. They became fossilized and were later revived through modern scientific research before arriving in White Chalk Town. This backstory lends a bittersweet layer to the story, touching on themes of extinction, survival, and the enduring bond between life forms across time. As the series progresses, new dinosaurs appear and the community continues to expand, with each volume adding further depth to both the characters and the world they inhabit.