When you accidentally trip and fall from the top of a building you close your eyes and fall to the ground and when you wake up you are in a bright the middle of a busy city with a woman and in front there is a choice of skills, namely, Fire, Protector, Archer, Healer

Elaina: “Hello I'm Elaina nice to meet you"

And under the collection of skill choices there is the writing "After choosing a skill you can increase your skill by killing monsters"