Mob, Reigen, Dimple, and the newest member of the Spirits and Such Consultation Office staff, 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 and the six of them head out on this super relaxing trip to the hot spring. But on their way there, Reigen and Serizawa start nodding off on the train and somehow get sucked into an eerie parallel world... (Source: Crunchyroll)

A summary episode of Mob Psycho 100 which features commentary from Reigen Arataka.

As another round of preliminary tests approach for Keitaro, so does Christmas. And as the first Christmas of the millenium, there is a rumor that if one confesses his love on this special eve it will come true. Keitaro has decided what he needs to do on this Christmas eve, but being a retaker can he afford taking attention away from the tests on the same day... The Winter has begun in Hinata. X-mas is coming up. There are rumors about this special christmas eve: If someone is going to confess his love on this christmas eve, any wish will come true. Keitaro decides to confess his love to Naru. But he isn't the only one confessing on this christmas eve... (Source: ANN)

As Yoko has her assistant scour the seabed in search of something, Madoka, unable to pilot Midori properly again, returns to Kamogawa to see the New Year in. Upon returning home, Madoka receives New Year's letters from Lan and Muginami, updating her about what's going on in their lives, to which Madoka makes a prompt reply. As the months pass by and Madoka moves up a year in school, Lan and Muginami visit an intergalactic replica of Kamogawa on the tourist planet Polyhedron. Takes place between seasons 1 and 2. (Source: Wikipedia)