Where do I go to renew my working Visa?

First you download the application form that applies to your visa status from the website below. You print it out and fill it out. There are 2 parts in the extension sheet, one part for you to fill out and the other part should be filled out by your school, probably the student affairs office. Then you submit this application form at your local immigration office, don't forget to bring your residency card and passport. Also remember, this might take 2 weeks to 3 months so be sure to do it well in advance.The list of types of visa and the extension of visa forms can be found on the following page:http://www.immi-moj.go.jp/english/tetuduki/kanri/shyorui/03-format.html

Thank you so much for the quick reply! I applied immediately and waiting now for answer :)