Classroom Survival: Start with the Beautiful Teacher

[Welcome to the world of class survival. [You are one of the tens of billions of time-travelers around the world. 1. Survive as a class unit. Your goal is to form and develop your tribe to become the strongest. [2. The initial main city is relatively simple, but it has certain defense, so you can give priority to upgrading the main city. [3. It is very dangerous here. There are all kinds of ferocious beasts during the day, and unknown monsters appear at night. Don't go out after dark. [4. There will be disaster copies from time to time, and dangers and opportunities coexist. 5. Please note that this is not a game! This is not a game! Once dead there will be real death.