Prince Bojji, a deaf and mute prince stumbles upon a member of the shadow clan, Kage where he is then forced to give up his own clothes for Kage to sell. Kage, taken aback by Bojji's kind nature follows him and observes his daily life.
Kage's tragic childhood following the purge of his people is recounted. As the match between Bojji and Daida continues, Bojji's fighting style is denounced as cowardly, and he is instructed by Domas to adopt a more regal style.
The day of reckoning arrives as King Bosse passes away. A mysterious devil - like figure appears and laughs maniacally while pointing at Prince Bojji. The new king was then to be decided in accordance to the late king's will.
Prince Bojji embarks on a journey to find Queen Hiling's parents alongside his sword master Domas and companion Hokuro to prove his worth and challenge Daida for the throne.
Surviving Domas's attack, Bojji is surprised to find Kage alongside him all this time. However, a mysterious poisonous gas seemingly appears and knocks Bojji and Kage out. Daida seeks out King Bosse's power to increase his rank.
The king's brother, Despa agrees to train Bojji after thorough persuasion from Kage. Although analyzing that Bojji would never be able to increase his strength, he still takes Bojji under his wing.
King Bosse's past is revealed alongside the reason of Bojji's handicaps. Hokuro is sentenced to death for Bojji's apparent demise and Domas must fight his inner demons if he is to return to the city or not.
Daida reflects on a lesson taught to him by Sorii and Bebin about the value of life and finds that he's not alone in his dark exile. When six criminals are broken out of their cells in the underworld, Desha sends his knights after them.
Miranjo summons six prisoners from the underworld and allows them to do as they please in Bosse's kingdom. As a response to the freed criminals, Desha sends his knights to take Bojin to the kingdom.
Domas takes on The Order of the Underworld as well as King Desha in a 1v1. Boji, Kage, and their new found friend, Gigan, arrive to the underworld staircase, forcing Boji to have an awkward reunion with Domas.
Desha tells Boji that he is after Miranjo, Boji realising that she is the one responsible for his mother's death. Desha wishes to take Gigan to the underworld because Gigan betrayed Desha's army in a war against his own kind, Gigantes.
Ouken, the immortal, escapes from Despa and The Order of the Underworld at the behest of Miranjo. The undying Ouken and Boji engage in combat, Boji and Kage being unaware of Ouken's immortality.
Miranjo faces her and Boji's mother at the bridge to the afterlife. Bosse joins the fight and faces Ouken, Invicvible vs Immortal, who will come on top.
Realizing that Bosse didn't wish to be brought back to life, Miranjo apologizes. Bosse issues an ultimatum to the others present--side with him or be killed. Despa fears that Bojji won't measure up as his showdown with Bosse gets underway.
King Bosse allows Daida to see the memories of his and Miranjo's time together. Prince Despa attempts to execute a plan he and King Desha made in order to save Ouken, 'The immortal', their brother, a plan involving a deal with the devil.
