[Sangetsu]

August the 18th is pretty close to now, unless you have a job offer already in hand, with a signed contract and sponsorship form from a company, you are not going to be able to extend your stay. You will have to leave as scheduled, and get another 90 day visa when you reenter Japan at a later date.

Most companies who hire foreigners are knowledgeable about the visa process, and will take care of the paperwork for you. If your interview with Toiwa goes well, and they decide to hire you, you will be given an application for a certificate of eligibility/work visa. You will have to supply documents to go with the application, namely, an original copy of your 4 year or better college diploma, and your passport. You will also need a copy of your employment contract, specifying your pay and the length of your employment, as well as a signed sponsorship form from the company.

Take all of these documents to the immigration office in Shinagawa (go to the east exit at the station and then follow the signs, they are in English, they will direct you to the bus which goes straight to the immigration center). Arrive as early as possible, preferably by 8:30am.

Provided all of your paperwork is in order, you should be able to get a stamp in your passport which will serve as an extension of your stay until your visa is approved and made. You'll be notified by mail when it is ready. You'll need to pay for the visa, the exact cost will be listed in the application form, and you can buy the payment stamps at the convenience store on the first floor of the immigration building.

Once you have your work visa, you can get a residency card (gaijin card) at your city office. After getting your residency card, you can then open a bank account or get a drivers license.

Good luck.