gistfile1.php

<?php
/** Public Domain Software */

$html = file_get_contents('http://www.teriyaki.jp/odai/karaoke/index.php');
$html = mb_convert_encoding($html, 'UTF-8', 'EUC-JP');
$html = str_replace('</head>', '<meta name="viewport" content="width=device-width; initial-scale=1.0;"></head>', $html);

header('Content-Type: text/html; charset=utf-8');
echo $html;