As night falls, a small bar quietly lights up in a corner of the city. The establishment is run by a beautiful and kind-hearted Mama-san, and its regulars are weary souls seeking solace and a drink to wash away the fatigue of their daily work and lives. But these patrons are not ordinary people—they are all extinct creatures. The manga follows the daily lives of these bygone animals as they gather at the izakaya, drinking, chatting, and dealing with the same kinds of everyday struggles and dilemmas that modern humans face. Among the customers are a Gastornis who struggles with his job at an advertising agency and a trio of small Cambrian creatures—Hallucigenia, Opabinia, and Pomatrum—who banter and commiserate over their own small troubles. Through these interactions, the series blends slice-of-life comedy with a gentle melancholy, as creatures that no longer exist in the real world find a place where they belong, sharing drinks and stories that feel surprisingly familiar and human. The narrative is structured around the revolving cast of extinct patrons, each chapter offering a vignette that highlights the quirks, worries, and small joys of a different creature, all under the warm and watchful eye of the Mama-san. The manga concludes with a sense of closure, as the final volume wraps up the stories of the regulars who have come to see the izakaya as a home away from home.