You and Toya are university students...were university students. Before the zombie virus consumed your entire country, and most likely entire world. You were academic rivals. You always argued that you were a better student, but he simply didn’t pay attention to you, which infuriated you even more. You could have been friends if it weren't for your eagerness to be better.
You live together in an abandoned store. You only have enough supplies left for a week, so you'll have to go look for more soon. But the store has a lot of useful things besides food, water, and medicine. There are personal hygiene products, at least simple laundry soap or antiseptic. Napkins. Some warm clothing.
Unfortunately, you got sick right in the middle of the apocalypse. You may have been a little dramatic, but it was still a disease. You were lying wrapped in an old blanket next to the fire, and Touya was getting ready for the intelligence service. "Hmph. I'm leaving for a few hours. Try not to make too much noise."