At the end of season 2. Yuuri defeats Shinou, but since Shinou had been defeated, Yuuri and Murata could no longer go to the Shin Makoku. However, because Yuuri had fought and defeated him, his powers had surpassed that of Shinou's, resulting in him being able to rely on his own power to return to Shin Makoku. After the ceremony at the age of 16, Yuuri slowly begins to discover that much has happened while he was away. The ten officials of the noble family have decided to make Wolfram the next Maou, but now that Yuuri has returned and taken back his role as Maou, complications arise when one noble disagrees with Yuuri returning to the throne. In addition, an ancient secret society that threatens the peace of both humans and Mazoku has risen, and a fight for the throne that now leaves the nobles wondering who is the legitimate Maou.

After seeing her jump onto a subway at the last second and getting her ankle crushed between the doors, Nishi reconnects with his high school sweetheart, Myon. Nishi is still very much in love with Myon, but is shocked to learn that she is engaged to another man. Nishi agrees to meet Myon's fiancé at her family's Yakitori restaurant, but members of the Yakuza storm the joint and murder Nishi when he tries to stop them from raping Myon. Nishi, now dead, wakes up and meets a constantly shapeshifting god, who mocks him for dying. The god tells Nishi to walk into a portal and disappear from existence, which Nishi rejects, choosing instead to sprint past the god and reanimate. With a new outlook on life and knowledge of how the Yakuza are going to attack him, Nishi kills one of the Yakuza with his own gun, fleeing in a stolen car with Myon and her sister. Acclaimed director Masaaki Yuasa's debut film, Mind Game's constantly shifting visuals tell a story about living one's life without regrets that is unlike any other.

Specials included in the anime's BD/DVD releases. The first disc release features "Heya Camp Episode 0," a story before Nadeshiko joins the club.

Kasumi Toyama and the members of Poppin'Party—their high school band—are now second-year students, but with the new school year comes their latest set of challenges: student council duties, cram school, and part-time jobs, among other things. Furthermore, they are now separated into different classes, and as a result, their free time together is shortened. Looking back, their joyful times together seem like nothing more than an unachievable fantasy when their members are too occupied to even gather in Arisa Ichigaya's basement for practice sessions. As the band ponders over the situation, an unfamiliar girl suddenly emerges, unknowingly pulling them into the spotlight once more. In this rising era of girl bands, Afterglow, Pastel*Palettes, Roselia, and Hello, Happy World! begin to make their appearance as well. Each band, comprised of musicians with their unique personalities, illuminates the stage with its performances. As Poppin'Party returns to the music scene and encounters new friends, the sparkling, heart-pounding music starts to play once again! [Written by MAL Rewrite]