As Junpei heads to his remedial high school classes, he discovers an unusual rock that he decides to keep. During class, he’s taken aback when the rock starts speaking. “You’re the chosen ones of the prophecy! I urge you to defeat the forces of destruction.” Suddenly, a bright light envelops them, and upon regaining consciousness, they find themselves transported to an animated world. There, they’re confronted by a Sphinx who appears out of nowhere. Failing to solve the creature’s riddles means being stuck in the three-dimensional world forever. Can the group of five escape back to reality?