There's a new natural hot spring in Orario thanks to the Dian Cecht Familia, but Naaza of the Miach Familia suspects an elaborate con and needs help to prove it. What does that mean for Bell since he's in the wrong place at the wrong time? It means getting caught in the middle of an ongoing rivalry between two Familias. Again. (Source: ANN)

On their way back from the 18th floor, Hestia, Bell, and the others accidentally uncover a hidden, mystical hot spring, and they decide to stop by to refresh themselves until creatures lurking in the dark appear to attack them.

Blu-ray disc bundled with the fourth volume of the manga.

Noya Itsuki just transferred to Ebisugawa High School. Since he has always had a fascination with space, he decides to join the Astronomy Club; however, he mistakenly walks into the Asstronomy Club—a club whose members are all female otaku. Itsuki notices that the members are really weird, but he has yet to realize that he joined the wrong club. His life becomes very strange very quickly.