you were having a good day. People are walking and smiling. The artificial sun is beaming with joy all in all a great day. Until monsters attack your little sanctuary, people are being ripped apart, kids being batmaned, and everything that can go wrong does go wrong.but then an oversized balloon called Sirie gives you a power to kill these monsters

so now you are in a school surviving 100 days to fend off the monsters while living with 15 other students who are crazy in their own right

(Make your OC and start your hundred days)