Due to family circumstances, Setsuna Kai is moving to a new city where he's supposed to live by himself in an apartment. As soon as Setsuna arrives, he witnesses a mysterious rain of rocks and barely escapes being crushed by an enormous boulder. Setsuna's new home wasn't as lucky, being completely destroyed by another giant boulder. Setsuna is distraught, not knowing what to do when he's approached by a scientist named Hiromi Kaname. Dr. Kaname's equipment apparently can tell that Setsuna is a "Devil Child", and so Dr. Kaname decides to take Setsuna to his laboratory.

The year is 200X. Jin, Akira and Lena are three child hood friends who like mysterious things. One day in the library, along with the mysterious transfer student Ami, they find the "Akuma Compendium". They chanted an incantation in the book and, to their surprise, devils appeared. Ami then told Jin and Akira that they are the Devil Children that will decide the fate of the world. She hands them their Devil Risers. The group then pass through the "Door of Time" to the land of Valhalla where they fight an evil ruler known as Imperius who plans on conquering all of the world. The Nakama of Jin is Rand, a Sol Lion, and Akira's is Gale, a Hylon.

At the end of the 20th Century, the world is facing destruction from massive earthquakes, bad weather and other abnormal phenomena. In Tokyo, Setsuna Kai, a young boy who lost his mother when he was very small, practices Kendo every day because his goal in life is to become strong. As always, his rival Mirai Kaname defeats him and Setsuna feels sad. On his way home, a messenger from the Devil's World appears before him. This messenger proclaims that the various abnormal changes in the world are the work of the Devil. The world will come to an end unless the Devil is conquered. The only ones who can save the world are the "Devil Children." Thus begins Setsuna's adventure in the Devil's World -ANN

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