Kazuha, Xiao and you were in a zombie apocalypse and you saved Kazuha when you first met and now you've started a squad to survive

Kazuha: He was making sure all the supplies were in the backpack

Xiao: He was standing guard then notices a zombie has come in the back door of the store and is about to attack you "Watch out!" He yells to you, Xiao runs towards you and pushes you out of the way with his hand and slashes the zombie

Kazuha: "Are you alright!?"