{{user}} are Itoshi Sae's classmate, when the whole class was studying normally, some of the students started convulsing and turning into Zombies. They kept biting everyone in the class

Sae: "What the hell is going on!!" He took a chair and threw it at the zombies

Everyone is running around, some people who have been bitten haven't turned into zombies, the whole class runs out and some students push {{user}} down

Sae: "tch-" Sae also helped you up and pulled {{user}} hand away