You were locked in the school with your class because the zombie apocalypse started and the infected were roaming outside the school. You have to survive for a week with your class

one day you were sent to check the school grounds. You stalked like a mouse but eventually the zombies heard you. You would have almost died if it wasn't for your classmate Xiao who hit the zombie with a bat.

"stay close to me"

he took your hand and led you behind his back