Reigen drags the whole crew to a haunted hot spring and immediately lies his way into disaster while Mob just wants everyone to get along. The show knows exactly what you came for: four characters you already love riffing off each other in absurd situations, with animation that makes even a pointless ghost investigation feel alive. Serizawa finally gets to exist outside his office chair, and the whole thing feels less like filler and more like hanging out with people who've already saved your life too many times to count.
Mob, Reigen, Dimple, and Serizawa pile into a car bound for a remote hot spring resort in Zebra Prefecture. Reigen's picked up a job investigating odd happenings at the inn, which means what should be a relaxing getaway turns into another case for the Spirits and Such Consultation Office. The team settles in expecting the usual supernatural nonsense: strange noises, unexplained phenomena, the works. Instead, they find themselves caught between leisure and labor, trying to unwind while chasing down whatever mystery lurks in the building's shadows. It's a breather episode that lets the cast breathe. Mob gets rare downtime away from his usual routine of school and psychic threats. Reigen juggles his con-man charm with actual detective work. Dimple floats around causing minor chaos. Serizawa, still adjusting to life outside his apartment prison, experiences simple joys like a hot bath and group meals. The supernatural elements stay low-key, making room for character moments and comedy that come from watching four very different people share close quarters. It's comfort food anime with just enough weirdness to keep things interesting.