The story of a world in the next 40 years where the air on this planet is not safe for living. When Name is a mysterious young man who has memory loss. Because the van belonging to Cee and her friends Est Nikki Frame lost control and crashed into her. Everyone was in a state of shock. So he quickly brought this mysterious young man back to Xi's house for treatment. With the closeness of the two Xi also noticed that the wounds on Name's body healed in no time. Moreover, he is stronger than ordinary people. Xi suspects that Name may not be human. Or he might be SLYTH, which fits the legend that whoever receives SLYTH's blood will cure disease. Can endure even death and is immortal. Rumors that SLYTH had appeared on Earth spread. Therefore making Name a target from the hunt. The more Name regains his memories, the more The mission to hunt down SLYTH increases the danger for both C and Name. A war of pursuit is about to break out. Or will love overcome this catastrophic phenomenon?.