Train to the End of the World (终末列车要开往哪里？ 特别篇)

In a seemingly ordinary rural town, something strange is happening to the residents. But Shizuru Chikura is more concerned for her missing friend. Determined to find her, Shizuru and three other girls board an abandoned train and travel to the outside world, unsure if they'll make it back alive. As they venture toward the unknown, the question looms: What awaits them at the final stop?