Sora Naegino has finally consolidated herself as Kaleido Stage's greatest star ever, and a new star starts to shine as Rosetta Passel is selected to participate in the next attraction in a main role. But when things start to go wrong in the rehearsals, Rosetta starts to question her abillity to take the role, as her own capacity to remain in Kaleido Stage. Meanwhile, Fool also struggles with his demons from the past.

After the mysterious mana calamity, Rudeus Greyrat and his fierce student Eris Boreas Greyrat are teleported to the Demon Continent. There, they team up with their newfound companion Ruijerd Supardia—the former leader of the Superd's Warrior group—to form "Dead End," a successful adventurer party. Making a name for themselves, the trio journeys across the continent to make their way back home to Fittoa. Following the advice he received from the faceless god Hitogami, Rudeus saves Kishirika Kishirisu, the Great Emperor of the Demon World, who rewards him by granting him a strange power. Now, as Rudeus masters the powerful ability that offers a number of new opportunities, it might prove to be more than what he bargained for when unexpected dangers threaten to hinder their travels.

Once respected as the Demon Realm's second greatest authority, the Demon King's aide, Jahy, ruled her subjects with fear. But when a magical girl attacks and destroys a mystic gem containing massive power, the Demon Realm is destroyed. Although she survives, Jahy has lost almost all of her powers and finds herself stranded in the human world with a childlike appearance. In order to gather more mystic gems so that she can permanently restore both her original form and the Demon Realm, Jahy will have to adjust to her new life and deal with everyday problems that she has never experienced before. From working to pay for living expenses to arguing with her landlord whenever her rent is late, the great Jahy will not be discouraged!

Two scientists are attempting to distribute the cure for a demon virus that is affecting people all over Japan, however, things have become complicated. One of them has become infected. So begins his battle with himself, as he attempts to not only control his emerging demon side, but also to save the lives of others by wielding its great strength.