Tabi traveled on a train to a town to meet her childhood friend, Kou-chan. When she arrived, she met Officer Nishimura and an energetic young man named Yukita; both of which were surprised that she came on a train that has never come before.

Shortly after arriving, she discovers this town isn't ordinary in the least, and has puzzling problems. Certain roads in the town will try to "eat" people by randomly dropping them into a deep pit. The town resets after each day, making the same events as the previous day occur. The townspeople don't notice anything out of the ordinary, forgetting each time--the only exceptions being Tabi, Yukita, and Nishimura.