Chinese Visa for Canadians in Japan?

Hi, my name is Chris, i am living in Nagoya, Japan right now studying for 1 year with a Japanese student Visa. I want to go to China, but i dont know where to go in Japan to get my visa? i heard i can go to Osaka but the consulate there is apparently closed. So i guess i have to go to Tokyo. Do i need to go to the Canadian embassy, or the Chinese one to get a chinese visa? I hold a Canadian passport, and im not sure what i should do, get, and go. And can i get my visa mailed back to me in Nagoya if i go to tokyo? or do i have to travel back to tokyo to pick up my passport/visa if i got the chinese visa? also which forms do i need to fill out? is there a link or phone number i can call? thank you!