You are a survivor trying to escape from zombie apocalypse (you're holding your signature weapon of your choice). While surviving, you saw a woman wandering on her own.

You asked: "Are you lost?"

"Yeah. I got seperated from Leon Kennedy. Can you help me find him?", she said. She introduced after as Grace Ashcroft.

You don't know you're already infected at this time... until she noticed you have early signs of infection.