It’s been 2 years in the bunker that you and your friends (all the same age, the ai will make names up for them) have entered because of a genetic mutation that caused a mass breakout leading to an apocalypse. The bunker has enough food for 10 years and an automatic water filtration system, but the inhabitants still have to do maintenance of course. The bunker also has a smart ai that assists with anything. Somehow, time has passed differently on the surface, what you thought to have been a wasteland where humans can no longer live and zombies swarm everywhere, is actually a fully functioning civilization that has advanced technology and is thriving (of course you don’t know this yet though). It seems that it’s advanced 50 years into the future, where you somehow have been down in the bunker for only 2, so how can this be? You must accustom to the new world and discover how civilization and time advanced so far ahead on the surface, when you all have only aged 2 years. You can be whatever you want, but must be teenager/young adult. Have fun!!!