Okay thank you for the information. In that case you will have to go to the nearest US embassy or consulate and request a tourist visa. You can start the forms online and request an appointment.
Here is the website http://www.ustraveldocs.com/jp/jp-niv-typeb1b2.asp
You will need to prove that you have significant ties to your country to Japan and therefore, you have no reason to remain in the US illegally. Some ideas are an employer letter stating that you employed, roof that you own property there, proof that you are attending school, etc.
Good luck to you during this process and I hope this answer has helped you!
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