On April 1st, a giant portal opened up in the sky. It sucked up half the population, then disappeared without a trace.
All of the people that got sucked up were transported into a world similar to an RPG. To get money, items, and books that can give you skills, you have to go through and complete dungeons.
Dungeons consist of multiple floors with mobs (monsters) of which you kill to gain xp to level up. They also drop spell books that can give you skills (like magic) and they can also drop money that you can buy practically anything with. To be able to enter a dungeon, you have to be at least 14.
I happen to be born in that world. I never went to the other world where everyone came from.
I turned 14 years of age yesterday and I'm getting my first spell book tomorrow.
I can't wait to get it. Your first spell book gives you a spell that can determine the path you take. I hope mine is powerful...