Tomoko Akiya

Yumeji Fujiwara, a young male student like any other, gained the power to see the aura of other people's dreams, and the ability to predict what kind of dream they will have next, after an event that occurred 10 years ago. Since then, he started to have strange dreams of cats following him for an unknown reason, where he learns, thanks to the boss of the cat army, John Doe, that his body is needed to access the real world. One day, as he was about to return home after his errands, a mysterious girl falls on top of him. This girl, called Merry Nightmare, is actually a dream demon, who's searching for a way to go back to her world. As Yumeji decides to help her, the gate to the world of dreams opens again, this time in full daylight. She appears in the daydream worlds looking for an answer to how to get back to her world. Meanwhile, an evil dream demon named Pharos Hercules is leading other dream demons to make humans into their vessels in order to raise an army, killing those that oppose him which causes humans to lose sight of their goals and ambitions. Yumeji eventually becomes Merry's partner, using his ability to scout out dream demons so Merry can hunt them.

One hundred Mamodo (lit. "demon") go to Earth every 1,000 years to battle to be the king of the Mamodo world. Each Mamodo needs a human partner in order to use his or her spell book, a book that seals the powers of the Mamodo. If the spell book is burned, the Mamodo is forced to return to the Mamodo world. The last Mamodo standing without their book burnt is the new Mamodo king.

Eight-year-old Doremi Harukaze aspires to be a user of magic, as she believes it would solve all her problems and help her confess to a boy she liked. One afternoon, she comes upon a magic shop and correctly suspects that the shop owner is a witch. The shop owner becomes a Witch Frog, "greenling", as this happens to witches when their true identities are discovered. In order to retain her original form, the shop owner, Majo Rika, takes Doremi as her apprentice to turn her into a witch. Doremi must take nine witch exams at night to become an official witch; however, she must never let her own identity as a witch be found out or the same fate that befell Majo Rika will happen to her.