I suppose you don’t know well about 5channel so I’ll do my best to tell you what it’s like. It’s a Japanese BBS website originally created by Hiroyuki Nishimura (current 4chan owner) which consists of tons of anonymous boards called “板”(ita; lit. board) that further contain threads in it. It’s been the biggest anonymous board website in Japan and produced countless memes for Japanese Internet community
Here on this site, you can look into their unique threads straight out of 5channel with English translation. Maybe you can learn a little Japanese as well as their funny Internet cultures.
You can start with these contents below!