The art book coming with the 25th volume limited version contains more than 100 illustrations, previously featured in magazines, media, etc.
You can support the author from those sites: Rakuten: https://a.r10.to/hNma9D BookWalker: https://bookwalker.jp/de7db7b8aa-d77d-482f-8840-caa15a522d6b/?acode=M3t9pwns AMZ:https://amzn.asia/d/7dHq9nk
After you buy it, if you still have some left, you can buy me a cup of coffee here: https://ko-fi.com/tbc247211