I am a post-80s youth, born in Japan, grew up in China, and now I'm back in Japan, waiting for graduation and employment. Take advantage of the little gap between graduation and unemployment, I would like to have an objective talk about various aspects of Japan's lesser-known "underground society". Thinking about the 10 years before and after in Japan, I just roughly organized it in my mind, and there is actually a lot to write about. The structure in the post may not be very neat, but I will try my best to write by chapters and then insert the topics requested by everyone. If you are interested in any topic, please request it~ I will reply to all requests. Criticism is welcome, but no personal attacks please~~