Granted. A wristband with an ornate button that reads "BACK" appears on your wrist.
You don't exactly know how it works though, "BACK" is pretty vague. But it's fine, you're in no rush. It's not going anywhere.
And if you're being honest, seeing it there feels reassuring. Anything you do can potentially be reverted. It takes some of the pressure off and you feel lighter, more casual.
You take stock of what's around you. Sure, it's not perfect. Your job could pay a little more, your place needs a few repairs, and you do miss some people who are now gone.
But also, you really like your job. Your colleagues are the best, the schedule is flexible. Your place is cosy, even with the old wallpaper. And you have your little sister. The two of you became so close these past years, and were there for each other when you needed it.
Do you really want to try and hit that button? Maybe you'll just go back a few days, and that would be interesting. But what if it was more? A few years? A decade? Back when your parents were still alive, sure, but you and your sister hated each other then, and you were in the middle of that busking phase.
How much are you willing to give this up, you wonder. You decide to sleep on it. The next day, you've made up your mind. Going back, you can change things for the better with all the knowledge you have now. You can protect the people you love, you can make better decisions. Maybe you won't buy that ukelele.
You take a deep breath and hit the button.
The room becomes hazy, and then a complete shaky blur. When it comes back into focus, you are standing in a field. There are many more fields around you and people are tending the crops, dressed in crude tunics held with leather belts. They are using rudimentary sickles and woven baskets.
One person shouts in surprise and points in your direction, and you have no idea what language that is. You've never heard anything like it. More people have poked their heads up and are moving in your direction with curiosity and caution.
Ar this moment, you realize two things: you don't belong here, and you've lost everything, forever.