Fifteen-year-old Kyousuke Kasuga moves to a new city and becomes enamored by one Madoka Ayukawa, who often treats him coldly even though she seemed friendly the first time they met, when he caught her red straw hat on the stairs. Kyousuke also must try to avoid breaking the heart of the slightly childish Hikaru Hiyama, who fell in love with him after she saw him make an impossible shot with a basketball and who likes to shower him with affection. Also, just to make things interesting, Kyousuke, his sisters, his grandfather, and his cousins all have various powers (teleportation, psychokinesis, hypnosis, time travel, personality transference) which Kyousuke desperately tries to keep a secret, though some of the other family members have no such qualms against using their powers in public. (Source: ANN)

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.

Kyou kara Maou! revolves around Yuri Shibuya, your average Japanese teenager. One day, Yuri sees a classmate being harassed by bullies. Thanks to this intervention, his friend is able to escape, but unfortunately Yuri becomes the new target of the bullies in the process and gets his head shoved into a toilet. But instead of water, the toilet contains a swirling portal that sucks him into another world, largely resembling medieval Europe. There, he is told that he will become the next Demon King due to his black hair and black eyes, traits only possessed by the demon's royal lineage. Yuri's arrival is met with some skepticism by some of the demons, who view him as unworthy to be their king. However, after Yuri wins a duel by utilizing his magical powers, the demons slowly begin to acknowledge him as their monarch. Yuri must now learn what it takes be a true Demon King, as he tries to keep the peace between demons and humans in this strange new realm.

Kae Serinuma is a very kind second-year high school student and a devoted otaku. A little known fact about her, though, is that she's obsessed with BL, or Boy's Love. Serinuma can't help but to fantasize about her male classmates falling for each other and enjoys imagining them together. A more known fact about Serinuma, however, is that she’s noticeably overweight. While watching her favorite show one day, Serinuma witnesses the death of her most beloved character. Utterly depressed, she can't muster up the energy to eat her meals, let alone attend school. After an entire week, she finally recovers. But now there's something unusual about her—during the time she refused to leave her room, she ended up losing a large amount of weight and has somehow become strikingly beautiful! Now catching the eye of everyone who sees her, she finds herself at the center of attention of four boys she has always known at her school. Though they all wish to spend time with her, Serinuma would much rather they spend time falling in love with one another. How will Serinuma deal with the four boys pursuing her BL-obsessed self? [Written by MAL Rewrite]