Reigen received a phone call at his office, the Spirits and Such Consultation Office. The client asked him to find out what the black shadow that kept destroying his fields actually was. Meanwhile, back at Salt Middle School, Kamuro announces that he's going to resign from the position of student council president. Elections to decide a new student council president are going to be held and Mezato convinces Mob to run as a candidate, but...

Reigen and Mob receive a new job. This time, their client is a wealthy man named Asagiri Masashi. He's not just rich, but super rich, so Reigen and Mob head to his mansion only to find other self-proclaimed psychics there as well. One of the psychics there happens to include the president of the Rising Sun Spiritual Union, Jodo Kirin. The job is apparently to exorcise the evil spirit that is apparently possessing his daughter, Minori.

The day for the annual marathon and Salt Middle School was drawing nearer. Mob proclaims that if he places in the top 10 he'll tell Tsubomi how he feels about her. Everyone around him cheers Mob on and he starts training hard every day until the day of the event. Meanwhile, Tsubomi and her friend Miki go to Reigen's Spirits and Such Consultation Office with a request. Ritsu happened to be at the office, helping out in Mob's absence, but he hears Tsubomi say something rather surprising.

Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.

Mob, Reigen, Dimple, Serizawa, take a trip up to a secluded hot spring called Ibogami Hot Springs in Zebra Prefecture. Reigen happened to get a request from the matron there to discover the truth behind the strange rumors going around there and save the inn. Ritsu and Teru also join in on this trip but on their way there, Reigen and Serizawa start nodding off on the train and somehow get sucked into an eerie parallel world...