Our detectives are back with the following intel on this WordPress site
The site is using the 賢威6.2 ヘルシー版 theme by 株式会社ウェブライダー .
We could identify 3 plugins (there might be more) -
All in One SEO Pack
Contact Form 7
Jetpack by WordPress.com
This information was last updated 09 July, 2017
The original WordPress SEO plugin, downloaded over 50,000,000 times since 2007.
Just another contact form plugin. Simple but flexible.
The ideal plugin for stats, related posts, search engine optimization, social sharing, protection, backups, security, and more.