"The Gate of Ruin will be opened"
"The Gate of Ruin" is the oldest gate where Horrors are said to have first appeared in the human world. For some reason, he said, it is on the verge of opening again. Ryuga, guided by Koyori, visits Creacity, the city where the gate is hidden. In the city where the smell of darkness leaking from The Gate of Ruin pervades, Ryuuga senses evil and immediately engages Horrors. In the midst of a fierce battle, a mysterious Makai Knight suddenly appears. That person was Soma Shirahane, wearing his "Hagane" armor.
What is the fate of Soma, who hunts Horrors as a titleless knight Hagane!? Will Ryuuga be able to stop the opening of The Gate of Ruin!? Now, a fierce story that approaches the origin of "The Protector" begins.