The story begins with a character known as Black Blazer, infamous for bullying others and favoring the color black. His hostile demeanor sets the stage for a serious turn of events.
One day, while attending science class at school, he overhears disturbing news about an incident occurring at the nearby hospital. After school, he heads to the rooftop, but chaos suddenly erupts when he sees students fleeing in confusion; he realizes the bell hasn't rung yet.
Amid the chaos, four students break away from the crowd, each heading in different directions. Initially believing the school day is over, Black Blazer is unexpectedly confronted by a zombie parasite that has climbed to his level. Desperate, he attempts to escape but finds himself cornered, with more zombie parasites closing in around him. In a frantic rush, he breaks a window on the second floor and sprints toward the front door. Just as he reaches his bike, a zombie parasite lunges at him, forcing him to fight back with wild punches against the approaching parasites.
He quickly left, but the entire half of the world was almost corrupted; as he drove the bike, A zombie parasite was standing there like it didn't hear anything, so he thought he could drive behind the parasite. One zombie ran to him.