The Great Jahy Will Not Be Defeated!

Childhood friends Tachibana Hinata and Jinguuji Tsukasa were living the everyday life of office workers. Then, on the way home from a mixer, they were sent flying into another world by a mysterious being. Once there, Jinguuji sees his best friend has been turned into a beautiful blonde-haired, blue-eyed girl...?! The adorableness of Tachibana’s female form completely flummoxes Tachibana. But these two are each others’ best friends. To keep their relationship from being destroyed, they must defeat the Demon Lord as quickly as possible and return to their original forms.

When Yuuko Yoshida wakes up one morning to discover that she’s sprouted horns and a tail, she learns something that her mother has been meaning to tell her. You know that battle between the Light and Dark that’s been going on since the dawn of time? Well, Yuuko’s family are the bad guys. So now, Yuuko has to defeat a local magical girl to win back some of her family’s vanquished power so they can afford to go to the all-you-can-eat pancake restaurant. And, of course, it turns out that the Magical Girl goes to Yuuko’s school, but Momo’s really nice and keeps rescuing Yuuko, which is pretty embarrassing and leaves Yuuko rather conflicted… but… all you can eat pancakes?

After his embarrassing defeat at the hands of a brave hero, the Demon Lord is back and ready for revenge… but after ten years apart, the hero, Max, isn’t the dashing do-gooder the Demon Lord remembers. In fact, Max has turned into a shut-in slob with no interest in an epic rematch. Can the Demon Lord whip his former nemesis back into shape, or will he be defeated by the hero-turned-couch-potato once again and join him in his lazy life?

The demon Jashin-chan has been summoned to Earth by Yurine Hanazono, a girl with a knack for the occult. Unfortunately, Yurine does not actually know how to send Jashin-chan back to Hell. Now stuck on Earth, she must live at Yurine's apartment as her familiar. The only way for Jashin-chan to return would be to kill her summoner, but this is easier said than done for the incompetent demon. Since Jashin-chan is immortal and can regenerate her body, Yurine does not hold back in attacking her with a range of weapons, punishing her in gruesome manners for her evil schemes. Jashin-chan is also often visited by her demon friends: the kindhearted Gorgon Medusa and the energetic minotaur Minosu, who seem much more well-behaved in contrast, and disapprove of her plans to kill Yurine.