The year is 200X. Jin, Akira and Lena are 6th Grade friends who have grown up together. They are also members of the `Mystery Club` which searches for interesting and mysterious things.
While snooping around in the school's library, they happen upon a mysterious book containing various spells and incantations. Curiosity overwhelms the group as they decide to carry out a summoning ritual, unprepared for the consequences... To their surprise, an evil demon appears and their only hope comes from a peculiar new student, Amy, who gives Jin and Akira the power to capture and summon demons by the way of the gun-like Demiloc. They are also joined by Rand and Gale, guardian demons sent to protect them.