KUSANAGI for ConoHa で Nginx + WordPress + FuelPHP を正常に動作させる

よろしくお願いいたします。

前提・実現したいこと

KUSANAGI for ConoHa にて、Nginx で WordPress と FuelPHP を以下のURLで動かしたいです。

＊ 通常/adminとするとwp-adminに飛ぶと思うのですが、そうせずFuelPHP側が表示されるように

# ディレクトリ
/
└ home/
    └ kusanagi/
        └ www/
            └ wp-config.php
            └ DocumentRoot/
                └ wp-admin/
                └ wp-content/
                  ...
            └ admin/
                └ fuel/
                └ public/
                    └ index.php

発生している問題・エラーメッセージ

Nginxのconfファイルがうまく書けず

• http://example.jp/adminにアクセスしても、FuelPHPのwelcomeがでない
• http://example.jp/admin/hogeにアクセスすると、WordPresのPage not foundが出る

該当のソースコード

# /etc/nginx/conf.d/www_http.conf

server {
     listen 80;
     server_name example.jp;
     access_log  /home/kusanagi/www/log/nginx/access.log main;
     error_log   /home/kusanagi/www/log/nginx/error.log warn;

     # rewrite ^(.*)$ https://example.jp$request_uri permanent; # SSL ONLY
     charset UTF-8;
     client_max_body_size 16M;
     root  /home/kusanagi/www/DocumentRoot;
     index index.php index.html index.htm;

     location /admin {
         alias /home/kusanagi/www/admin/public;
         try_files $uri $uri/ /index.php$is_args$args;
     }

     location ~ ^/admin/.+\.php$ {
         fastcgi_pass 127.0.0.1:9000;
         fastcgi_index index.php;
         include fastcgi_params;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
         fastcgi_param FUEL_ENV "production";
     }

     rewrite /wp-admin$ $scheme://$host$uri/ permanent;

     location / {
        try_files $uri $uri/ /index.php?$args;
     }
...

# /home/kusanagi/www/DocumentRoot/.htaccess

<Files ~ "^\.ht">
    Deny from all
</Files>
<Files wp-login.php>
    Order deny,allow
    Deny from all
    Allow from all
    #Allow from 127.0.0.1
    AuthType Basic
    AuthName "ENTER YOUR NAME & PASSWORD TO LOGIN"
    AuthUserFile /home/kusanagi/.htpasswd
    Require valid-user
    Satisfy any
</Files>

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]
    RewriteCond %{REQUEST_URI} !\.(gif|css|js|swf|jpeg|jpg|jpe|png|ico|swd|pdf|svg|eot|ttf|woff)    $
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]
</IfModule>

# /home/kusanagi/www/admin/public/.htaccess

 # Multiple Environment config, set this to development, staging or production
 SetEnv FUEL_ENV development
 # SetEnv FUEL_ENV production

 <IfModule mod_rewrite.c>

     # RewriteEngine を起動
     RewriteEngine on

     # NOTICE: If you get a 404 play with combinations of the following commented out lines
     #AllowOverride All
     #RewriteBase /wherever/fuel/is
     RewriteBase /admin

     # Make sure directory listing is disabled
     # Options +FollowSymLinks -Indexes

     # Restrict your site to only one domain
     # !important USE ONLY ONE OPTION

     # Option 1: To rewrite "www.domain.com -> domain.com" uncomment the following lines.
     #RewriteCond %{HTTPS} !=on
     #RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
     #RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

     # Option 2: To rewrite "domain.com -> www.domain.com" uncomment the following lines.
     #RewriteCond %{HTTPS} !=on
     #RewriteCond %{HTTP_HOST} !^www\..+$ [NC]
     #RewriteCond %{HTTP_HOST} (.+)$ [NC]
     #RewriteRule ^(.*)$ http://www.%1/$1 [R=301,L]

     # Remove index.php from URL
     RewriteCond %{HTTP:X-Requested-With}   !^XMLHttpRequest$
     RewriteCond %{THE_REQUEST}             ^[^/]*/index\.php [NC]
     RewriteRule ^index\.php(.*)$           $1 [R=301,NS,L]

     DirectorySlash Off

     RedirectMatch permanent /admin$ /admin/login
     RedirectMatch permanent /admin/$ /admin/login

     # make HTTP Basic Authentication work on php-fcgi installs
     <IfModule mod_fcgid.c>
         RewriteCond %{HTTP:Authorization} .
         RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
     </IfModule>

     # Send request via index.php if not a real file or directory
     RewriteCond %{REQUEST_FILENAME} !-f
     RewriteCond %{REQUEST_FILENAME} !-d

     # deal with php-fcgi first
     <IfModule mod_fcgid.c>
         RewriteRule ^(.*)$ index.php?/$1 [QSA,L]
     </IfModule>

     # no php-fcgi, check for sapi and fpm
     <IfModule !mod_fcgid.c>

         # for PHP5 sapi installations
         <IfModule mod_php5.c>
             RewriteRule ^(.*)$ index.php/$1 [L]
         </IfModule>

         <IfModule !mod_php5.c>

             # for PHP7 sapi installations
             <IfModule mod_php7.c>
                 RewriteRule ^(.*)$ index.php/$1 [L]
             </IfModule>

             # for fpm installations
             <IfModule !mod_php7.c>
                 RewriteRule ^(.*)$ index.php?/$1 [QSA,L]
             </IfModule>

         </IfModule>

     </IfModule>

 </IfModule>

補足情報(言語/FW/ツール等のバージョンなど)