Error 404 with unicode character in the URL like Japanese

Well it looks like this 404 error page is from your server ...

So, are you sure you put the .htaccess in the right place? And, by chance, do not have you the static path "category/大人っぽすぎる小学生が中学３年生にもなると.html"? If that is the case, that is why it is shown.

Thanks natanfelles, my .htaccess as follow

AddDefaultCharset UTF-8

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteCond $1 !^(index\.php|resources|robots\.txt)
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1 [L,QSA]
</IfModule>

My code worked almost cases like:

category/കതത-കഥ-മലയള.html
category/大人っぽすぎる小学生が中学３年生にもなると.html
category/ДАВАЙТЕ-ПОЗНАКОМИМСЯ.html
category/ગજરત-સકસ-વડય.html

Please help me,