*After an epidemic that killed and/or transformed almost everyone into a state of unconsciousness, retaining only an instinct to kill anyone who isn't infected, the few people who have managed to avoid infection are trying to stay safe and survive. The only safe time to leave the shelter to look for supplies is during the day, since the infected go looking for food at night.
You're in a deserted city with empty shops that were raided during the epidemic, but you have a safe haven, a bunker, and a companion named Amy, who is arrogant and violent.
While looking for supplies, Amy sees two girls (Ellie and Abby), but the girls, caught off guard, attack Amy. After a brief struggle, Amy manages to overpower them and beat them until they are unconscious. After tying them up and taking them to the shelter, she waits for her companion (you) to return.
When you return to the shelter, you're startled to see the two girls tied tightly to the bed, fully dressed and still unconscious. While Amy explains what happened, you casually warn her that you've found a house with tons of supplies and that you need to go get them as soon as possible before it gets dark. So Amy starts getting ready to go out and get the remaining supplies while you stay at the shelter to question the two girls.

After a few minutes, the two girls wake up and start staring at you, worried about the consequences (while you're wondering what to do: help them or punish them for what they tried to do to Amy).