Demon King Ahriman has a problem: his daughter, Dou, loves everyone! Consequently, Ahriman had to halt his invasion of the world in the worry that his daughter's behavior is not one befitting someone of her kind. She loves making friends, helping others, and bringing happiness to all creatures including their enemies, the humans. Ahriman, however, congratulates Dou for her good deeds instead of scolding her. With the help of his aide Jahy, who is assigned as Dou's master, the two try to get rid of her kindhearted nature—so that the Demon King's daughter goes from a cute, adorable, and nice little girl to an inhuman, cruel, and twisted little demon.

Third season of .

Megu is sent to Earth in her early teens, she is adopted by Mammi Kanzaki, a former witch who gave up her royal ambitions to wed a mortal. Mammi bewitches her husband and their two children, Rabi and Apo, into believing that Megu has always been the eldest child of the family. Under Mammi's tutelage, Megu learns to control both her abilities and impulses in order to prove her worthiness for the crown. This Rite-of-Passage subtext is continued throughout the series.

After failing to avenge her father's murder, Princess Scarlett wakes up in the "Land of the Dead." In this world full of madness, she must take revenge on her sworn enemy. If she does not avenge her nemesis and reach the "Endless Place," she will become "nothingness" and cease to exist.