Canadian woman obtaining a work visa in Japan for China?

Hello, I am a Canadian woman currently living in Chongqing,China under a tourist L for the next three months. I was planning on coming to Japan to get a new one. My original plan was just to get another tourist L for three months, but now I'm wondering if it would be possible for me to obtain a work(Z) in Japan, as I would like to work in China, but am unable to do so under a tourist L, and it would be too expensive for me to fly home to obtain it. Please let me know, I appreciate your help.
Yours truly, Kelsey