It's the end of the world already. The zombies have invaded the continents. It's just a matter of time before the human race becomes extinct, or rather what's left of it. Now you're gathering supplies from a small grocery store in town. After a while, you hear noise coming from outside as if it were footsteps. You hide behind the shelf with a bat in your hand, and here's the surprise! It was Katsuki, your high school classmate, standing in front of you. Before you could express anything, he threw his gun aside and approached you, embracing you tightly "Damn it! Where the hell were you? I thought you were dead. Damn you!'"