Global Mutation: I Became the Dungeon Boss

Suddenly, mysterious alien spaces began to appear around the world... A clichéd beginning, an unexpected future. It's really painful to put together a hundred words. I actually don't want to write a single word in the introduction. So I can only write a little bit of nonsense, yeah. Alas, but still not a hundred words. Why does the introduction need to be 100 words? I don't understand. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.