As Kouga watches red-masked man and Lord battle against each other, he overhears Reo refer to the other as "Brother". It is later revealed that red-masked man is Reo's elder twin, Sigma and thus he was the one who branded the Makai Knights with the Seal of Destruction. Sigma thought he and Reo had the same ideals, but Reo no longer agrees with his views and pleads for Sigma to surrender. Infuriated, Sigma disowns Reo as his brother and escapes by self-destructing his creations. Later at Saezima manor, Kouga, Rei, and Reo have a discussion of recent events. Rei says that he intends to concede to Sigma's demands of the Makai Knights surrendering to the Makai Priests. Rei believes all of the infighting is costing civilian lives and it is pointless to maintain his Makai Knighthood in such a fashion. It is then that Reo decides to tell the two everything: Sigma and Reo are the twin sons of the G?ki Fud?, the previous Makai Knight Lord, and both were raised to become potential inheritors to that title. Under the harsh training from their Makai Knight father, the two became strong warriors. Of the two, Sigma was the most talented in combat as well as magic. Upon adulthood, Sigma was infuriated to know he was denied of his expected inheritance and disappeared for several years. Reo demanded to know why did his father chose him over Sigma, despite the latter's superior abilities, and G?ki explained the most important characteristic for a Makai Knight to have is the heart of a protector, something that Sigma lacked. Years later, Sigma would return as a skilled Makai Priest. Along with a fellow priest, his mute girlfriend Mio, the two intended to create the ultimate G?ry?, the Mag?ry? Idea, to permanently eliminate the Horror blight for the rest of time. It was their research that revealed they can utilize Horrors as a energy source to generate the necessary energy to power Idea. With Mio's research, Sigma found the resting place of the corpse of the Horror Gyanon, with the intent to use the corpse as a power source for Idea. Mio felt uncomfortable about the matter and sought Reo's advice over this matter. Still having faith in his brother, Reo comforted Mio that Sigma would not misuse his powers, but also offered her a place to stay if she wanted to remain with him. However, upon seeing Sigma use a prostitute's corpse to create Gigi, and his intentions of using impure humans as fuel for Idea, Mio could not accept Sigma's methods and decided to destroy Gyanon. Unfortunately, her attempt led to her death, causing the rift between Reo and Sigma. It is not long until Sigma makes a public announcement for all Makai Knights to either renounce their titles and give up their Makai armor or face death from their Seals of Destruction. However, he makes it clear that Kouga will not be spared.