When thirteen-year-old Daniel Venture visits a doctor to treat his skin condition, he discovers that she has zero intentions to cure him, and instead kidnaps his mother to a parallel world. For the opportunity to search for his mother, Daniel trades his eyes.
And he wakes up in a parallel universe, haunted by demons. Daniel discovers that while he was unconscious, a local doctor named David filled his empty eye sockets with artificial red eyes. With these new eyes Daniel sees a walking skeleton pierce a woman’s shoulder and realizes that he is incapable of battling his mother’s kidnapper, who is a demon herself.
To gain the knowledge of fighting demons, Daniel enlists in a military academy. But on his first night Daniel and his roommates wake up for the Chief Commander’s investigation: something has been stolen and the thief is suspected to be nearby. But soon Daniel overhears a conversation between two teachers and learns that his dead father was once working on the reproduction of a Pyramid Diamond, whose blueprints were now stolen from the Commander.
Daniel and his new friend suspect that the thief is the class bully. He wanders about during their guard duty, and they give chase, but accidentally find themselves in a nearby pub full of demons. In this very pub Daniel spots the kidnapper.
After Daniel and his friend successfully catch a giant bee demon they are convinced that they can enter the pub and catch Guy red-handed, using the blueprints to recreate the Pyramid Diamond.
When they enter the pub, it’s not the class bully who they find, but David. He was the one they had seen during their guard duty, and he also stole the blueprints. Even worse, when David implanted Daniel his artificial eyes, he wasn’t doing him a favor, on the contrary—these eyes were used as a surveillance system, meant to follow Daniel all the time. And now, with the Pyramid Diamond finally complete and Daniel fallen into his trap, David can summon the king of all demons—Asmodeus.
Asmodeus tells Daniel that his mother was used as bait to lure Daniel into the parallel world because what Admodeus really desires is Daniel’s immense telekinetic energy, which he will gain using the Pyramid Diamond. But he also offers Daniel to pass his energy over to him and in exchange for his mother’s life to join his army of demons.
Daniel refuses and Asmodeus begins draining Daniel’s energy. But then Daniel realizes that in order to destroy Asmodeus he must destroy his demonic eyes. He takes out his eyes, and stabs them with a knife. Asmodeus is destroyed and Daniel loses his conscious.
When he wakes up, he can see with only one eyes because the other one was beyond repair. The Chief Commander tells him that Asmodeus was only receiving orders from another, more powerful, demon—Azazel—and his mother is probably safe.
But the Chief Commander also tells him about his grandparents that are alive and would like to get to know him. Daniel leaves the academy to stay with his grandparents, knowing that no matter who will try to kill him in the future, it won’t be that easy because now he is much stronger.