It has been a long time since the end of the prosperous and glorious human civilization. The world has come to an end, with almost no humans and even living things disappearing. The complexly built cities have turned into ruins like a maze, and the machines that cannot be maintained have gradually stopped working. When did it end? When did it start to end? In the end-of-the-world where even this thought no longer exists, two girls continue to travel aimlessly. Chihuo and Yuri, today, are also wandering in the ruins in their beloved car Kettenkrad. The anti-utopian fantasy drama of warm survival in the end-of-the-world begins here.