This is a list of free, Japanese blogging platforms, 30 in total. You can use them to start a new blog on any topic or language, however most are only available in Japanese. Enjoy!

1. http://ameblo.jp
2. http://blog.livedoor.com
3. http://jugem.jp
4. https://blog.fc2.com/?lang=ja
5. http://blog.seesaa.jp/contents/about/?via=a8
6. http://d.hatena.ne.jp
7. http://blog.so-net.ne.jp
8. http://www.ninja.co.jp/blog/
9. https://plaza.rakuten.co.jp
10. http://blog.goo.ne.jp
11. https://www.exblog.jp
12. https://blogs.yahoo.co.jp
13. http://www.cocolog-nifty.com
14. http://webryblog.biglobe.ne.jp
15. http://www.yaplog.jp
16. http://gamecs.jp
17. https://www.eniblo.com
18. http://blog.kuruten.jp
19. http://h.hatena.ne.jp
20. http://www.foodlog.jp
21. http://a-thera.com
22. http://www.areablog.jp
23. http://blog.goyah.net
24. http://contents.shumilog.com
25. http://www.niwablo.jp
26. http://autopage.teacup.com
27. http://www.blog.bbiq.jp
28. http://point-b.jp
29. http://www.blogone.jp
30. http://www.rentafree.net

Source and further guide here:

https://www.webhostwhat.com/free-japanese-blogging-sites-the-big-list/