Pretty cool. Others have already stated that this reads like someone wrote a scenario for a game they don't fully understand the mechanics of. I would personally have liked to see more interaction with the survivors, and a better reason for entering. Maybe like a "we traded our important macguffin, and now it's dormant because we have no fresh shiny tech, can you maybe go in there to buy it back with your cool weird modern tech" would give a strong reason to engage with this, and it also telegraphs the gacha trade mechanic a lot more exciting because they keep trading important stuff to get the quest item.
Otherwise, this is cool. I'd personally borrow pieces, and add a few more human interactions and a better driving motivation (like mentioned above) but I'd run this.