Mob Psycho 100: Dai Ikkai Rei toka Soudansho Ian Ryokou - Kokoro Mitasu Iyashi no Tabi

Reigen, Mob, Ritsu, Serizawa, and Ekubo head to Ibogami Hot Springs for a company vacation that promises rest, good food, and relief from their usual supernatural work. The trip is not entirely recreational, however, as the inn's owner has asked Reigen to investigate strange activity in the area.

On the train, Reigen and Serizawa fall asleep and awaken inside an eerie parallel world while everyone else continues toward the resort normally. Trapped in a repeating, ghostly journey, the pair must find a way back before the vacation they desperately wanted passes them by.