1000 years ago, dark creatures from space holes invaded the earth. And Ilgralun is one of them. Conflict between the dark creatures occurred and Ilgralun became a sinner. He was imprisoned by his own allies in a dark prison. As foresaw the future, the seer named Kira helped Ilgralun escape from the dark prison. She successfully won Ilgralun's loyalty and persuaded Ilgralun to fight against the dark creatures. From there, a blood contract was signed, Ilgralun and Kira, two different creatures merging into one. And with the support of each other, the two gave each other a tremendous power and they defeated the dark creatures and imprisoned them in the abyss. And so the days of peace gradually passed. Until one day...........................................................Grand Sorceress Loren frees dark creatures from the abyss to destroy this world. And Ilgralun, a criminal who betrayed his allies will be the first target for the dark creatures to hunt. And an event in the past happened once again, a blood contract between two different creatures continued to be signed. But both of them were still not strong enough to defeat the dark creatures. Because of that, they searched for more allies and their journey began