A strange virus spreads throughout a school and the city is probably infected too. This virus transforms the dead into living corpses that eat human flesh and brutally attack everything in their path. In search of survival, a couple of students do everything in their power to not die in the school full of zombies. But in the midst of this chaos, other conflicts will arise between the survivors, splitting them apart.

A celestial dragon, a being that could bring peace to the land of Babylon, ending the war against dragons and humans. But there was also the existence of the celestial human, a being who brought peace to the land of Lyonesse. And so, these two beings became known as "the Rulers". However, the Rulers were both equally strong, and thus it became difficult for them to be able to bring peace together. And so, they decided to entrust their successors with bringing peace upon the land, instead. The successor of the celestial dragon, known as "the Dominion Ruler", was given a crystal known as the Dragonheart. It was said that this crystal contained power equivalent to that of the celestial dragon. And so, by using this Dragonheart, the successor would eventually become the Dominion Ruler. On the other hand, the successor of the celestial human, known as "the Monarchy Ruler", was given something else. That was the Sacred Treasure known as "the Monarchist Sword". By using this sword, the successor would eventually become the Monarchy ruler. The king of Babylon, Gilgamesh, dreamed of the successor of the celestial dragon. So, to obtain the peace his land deserved, he traveled in search of the dominion ruler. Those dreams not only reached the king of Babylon, the king of Lyonesse Arthur Pendragon, also have prophetic dreams. About the successor of the celestial human, the monarchy ruler. So both kings left their homes in search of those destined ones that would bring peace to their lands. But what they didn't know was that only one realm would be able to obtain peace.

Omegaverse. In a world where magi summon heroic spirits called Servants for a brutal battle known as the Holy Grail War, a desperate young man named Dante seeks to defy fate. His six-year-old brother Luca lies dying from a mysterious, incurable ailment - black markings creeping across his pale skin like dark flowers blooming under the surface of his youth. Determined to save the innocent life that depends on him, as a chosen master, Dante travels to Japan to partake in the war, hoping to claim victory. By winning the war, he will obtain the Holy Grail. Its granting power was said to fulfill any wish, no matter how grandiose or impossible. To win, Dante must summon a powerful servant, however, in the streets of Fuyuki, Dante's encounter with the King of Heroes will alter the course of events.