At the beginning of the semester, Takashi Komuro has a falling out with his childhood friend Rei Miyamoto. When he goes outside to mope, he witnesses a zombie attack a teacher at the front of the school. Takashi goes to warn Rei and his friend Hisashi, who is dating Rei, and escapes with them just before news of the attack spreads across the school, causing panic. The three run into a zombie that bites Hisashi in the arm before Takashi kills it by smashing its head. While Saya realizes what is happening and approaches nerd Hirano for help. Rei, Hisashi, Takashi barricade themselves on the rooftop to witness Self-Defense Force helicopters flying in to combat the zombie outbreak in the city, oblivious to the carnage in the school. Meanwhile Saeko Busujima, the president of kendo club, begins to rescue other students. Hisashi begins transforming and asks Takashi, who is in shock, to kill him before he turns. Soon Takashi is forced to kill him, despite Rei's emotional objecting. As the zombies attack the barricade, Rei and Takashi embrace briefly.
