This Japanese, animated show is based on the Xbox 360 game of the same title. Each year for the past ten years strange, purple clouds have appeared in the sky, bringing disasters to the locales over which they hang. Shu, Kluke, and Jiro are determined to fight back. Through some gnarly misadventures, the three friends find themselves trapped in a flying fortress. They end up swallowing glowing orbs which has the strange result of making their shadows transform into monsters; Kluke's becomes a blue phoenix, Jiro's a blue minotaur, and Shu's a blue dragon. Following their escape from the floating fortress, they encounter more people from towns that have also fallen victim to the purple clouds. The three friends realize they have to use their shadow-monster powers to stop Nene (the commander of the floating fortress) from destroying their world.
A boy named Shu is obsessed with knight masters learns that one has appeared in his village. Shu gets excited at this possibility and goes in search of him. His village gets attacked after finding the "knight master". Shu unleashes his true power after finding his friends are in trouble.
Shu and the others manage to protect the village from the enemy. The ‘Knight Master’ (Zola) convinces Shu to come along on their journey.
Shu begins his training with Jiro. Zola tells Jiro that he is opening his weak spots while he attempts to power up. They are attacked by a red-haired shadow user sent by Nene. Jiro defeats him and the party arrives at a ruined city.
Marumaro attacks Shu and the rest, thinking they are responsible for destroying the city. They set a trap and capture Marumaro. After being freed by Zola, Marumaro finds the citizens and Nene's minions. Shu and the rest join the fight and face a pair of twin shadow users. The twins withdraws from the fight and Marumaro joins the team.
Zola and the team assault the fortress to free the captives from the city. Rogi defeats Zola, then defeats both Jiro and Marumaro. He leaves for an audience with Nene, leaving the twins in charge. Shu manages to manifest and control the Blue Dragon, defeating the twins in the process. Shu and the rest then receive a mission to escort Legolas to the capital.
Shu and companions stop at a town for lunch. Shu saves a well-endowed waitress called Bouquet from two men's harassment. She tries to repay his kindness, but keeps messing things up. Bouquet turns out to be a shadow user. Her shadow, Hippopotamus, is weak in combat, but can shapeshift. After she loses her job, they run away from her, with Bouquet chasing them from behind.
Rogi receives a team of shadow users and Nene commands him to get rid of Zola. When the companions reach the capital, they decide to solve a haunting mystery. The "ghost" turns out to be a shadow user, who attempts to destroy the military storage. Shu and Marumaro defeat him and he is taken by the guards. Along with Legolas, the companions finally meet the king.
Zola and company meets the king who grants her access to the ancient library. Shu finally meets a true knight master. Bouquet arrives at the city to find it under attack from Nene's robotic shadow users. Shu and company joins the fight. An ancient scroll is stolen in the chaos and given to a mysterious character.
Jiburaru time is safe now! The gang is now preparing to attack the grand kingdom. In the book of origin some pages were ripped off. Apparently, the last seven pages of it were ripped off. The ghost criminal was seen dead outside the city.
The gang begins the attack to attack the grand kingdom. Rogi attacks with his dragon.
Shu and general Rogi fight. The whole gang is fighting Rogi's whole group. While Shu was fighting, he realized he had a new technique. the commander and the others are planning to destroy Shu and the others.
Rogi and the others ran away from Shu and the gang. After the fight Shu and the others got separated accidentally, but the commander, Rogi, and the others will be planning to surprise Shu and the gang again. Rogi and the others are trying to find each other.
Shu finds the gang and and now is in the Grand Kingdom's capital city. While that, Grand Kingdom's army is fighting Jiburaro Kingdom's army. Shu Nand the others get inside Nene's place(nene is a villain). While Shu and the others are finding Nene, they discover that Nene is planning to take out children's shadows and using them as their weapons.
Shu and the others have finally found Nene. Shu, Jiro, and Marumaro fight Nene while Jiburaru's army is having a hard time fighting Grand Kingdom's army. But then, Shu, Jiro, and Marumaro got to a big disaster and Zola needed to get in.
Shu worries of Kluke being unconscious, while Jiro worries about defeating Nene. Shu and the others discovered that they still have a hold on the criteria on the suspect who killed the saineles. They say that the suspect is a age of 20 to 30,she has blue hair, and has perfume on her body. So, Shu and the others decide to get the extra seven pages to get stronger and defeat Nene.
Kluke has woken up and is good now. Shu and the others continue their journey to the book of origins. Now Shu and the others are in logic city in their journey.