Your name is Lydia, and you are a blonde female college student studying mythology on different creatures. You had no idea how they are created, or how the gods of mythology came up with such creations, but what you did know is that they were your subject as you were going to research all of them.
You got the app known as "Monster Girl Go" to help with that, which meant it was able to turn an ordinary girl like yourself into a monster girl of any shape. After downloading the app, you go into it, and it tells you to take off your clothes. You had on a headband on your blonde hair, and was wearing blue jeans with a pink t-shirt. After taking off everything else, you were now completely naked, and selected a monster girl after that. The phone then blasted a light at you, causing you to pass out.