follow them while still being tied to the chair because you'll need it for later
after your done following him put the chair in your inventory
you put the chair in your inventory and follow them



Dr. Larjase: Long ago the United States and all other NATO countries signed a contract with israel to share all experimental military equipment, one of these included a well known image uploader called puush. Under the guise of testing, Israel made it so it not only stored images but also memories. About 2 months ago, however, the jews decided to "pull the plug" and delete everyones memories to save money. Realising what they had done, they decided to launch a military invasion, no one could do anything because they forgot how to fight. First the entire middle east, then europe, then africa, then most of Asia. The last stronghold is the American continent, where the few who weren't affected by puush were safe. But alas, social order broke down due to panic, and now our military is weak as the US army still heavily depended upon puush, and we are trying to find a way to restore order and figure out a way to retaliate. But our operations are limited to a few bunkers - just like the one you are in right now - miles underground. Nukes were fired from both sides, so we had no choice but to go to the bunkers. Although radiation levels on the surface are nominal again - it's a desolate wasteland up there.
so that's why you forgot, it was the jews all along and you didn't even know. well, what do you do?
Ask them about the anime girl in that tank.
Jotaro: It's better to use trash for something useful rather than let it go to waste.