An ordinary day

After getting a mysterious box and finding a pendant inside do you make a wish. But you get a little more than you bargained for as you are sent to a completely different world! But in this world, you have to go along with the story line without changing history's course. The twist is, you already know what's going to happen! You must complete this trial in the world of Astro boy without changing the events of the story in order to get home. Can you do it? Can you go home?