Chinese tourist visa in Osaka

I'm a Spanish national Right now I'm in South India, very far away from any Chinese embassy. In a few week I'll fly to Bangkok (BKK) and from there to Osaka (KIX). After a few more weeks in KIX I plan to fly to China.
Question is, looks almost out of reach to get a Chinese tourist L in BKK if you're not in possesion of a Thai resident permit or long visa in that country. What about KIX? You have to be a foreigner with a Japanese resident permit to get it or it's enough go be a humble tourist a few days in Japan to get it for China in Osaka consulate? Anyone knows about reauirements there?
Thanks a lot
Miguel