Our detectives are back with the following intel on this WordPress site
The site is using the メシオプレス03 theme by MN .
We could identify 3 plugins (there might be more) - All in One SEO – Best WordPress SEO Plugin – Easily Improve Your SEO Rankings , WordPress Popular Posts and Yet Another Related Posts Plugin (YARPP)
The original WordPress SEO plugin. Improve your WordPress SEO rankings and traffic with our comprehensive SEO tools and smart SEO optimizations.