Dayan, who cannot read the language of Ars (Earth), sets off on a journey to find Zitan, who has gone off to the north, in order to have him read the letter.

The devil king Lucifero suddenly declares he's going to retire, and must choose a successor. The Devil King Cadets gather one after another, and go to the human world to participate in the succession contest. But only the devil king's own descendant Osamu has no interest whatsoever in the contest. Compared to the fate of the world, Osamu is more interested in his part-time job at a convenience store. Osamu has no choice, however, but to start collecting familiars called "Child," which are born from human souls. Osamu still only has an interest in his part-time job, and he's a few steps behind the rest of the Cadets.

THE IDOLM@STER 765 MILLIONSTARS HOTCHPOTCH FESTIV@L!! was a two-day concert event that took place on October 7th and 8th, 2017. The concert featured a variety of songs and performers from 765 Production, such as ones from THE iDOLM@STER Million Live!, and took place at the Nippon Budokan Arena in Chiyoda Prefecture, Tokyo. Both days of the concert were filmed and released on Blu-ray in standard separate and limited edition boxset formats on November 21st, 2018.