https://doujinblog.org/%e5%90%8c%e4%ba%ba%e9%9f%b3%e5%a3%b0180711-sometimes-bad-tool-%e4%bf%ba%e3%81%ae%e5%a6%b9%e3%82%92%e3%81%84%e3%81%98%e3%82%81%e3%82%8b%e3%82%af%e3%82%bd%e3%82%ac%e3%82%ad%e3%81%af%e6%84%9b/