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header {
	background-color: #fff;
	position: fixed;
	width: 100%;
	z-index: 5;
}
header h1 span {
	font-size: 12px;
	color: #222;
	font-weight: normal;
	display: inline-block;
	vertical-align: middle;
	transition: .3s;
	font-family: "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, Osaka, "ＭＳ Ｐゴシック", "MS PGothic", "sans-serif";
}
header h1 a {
	font-size: 17px;
	color: #d50000;
	font-weight: bold;
	padding: 5px 25px;
	float: left;
	position: relative;
	z-index: 5;
	-webkit-backface-visibility: hidden;
	backface-visibility: hidden;
	width: 50%;
	overflow: visible;
	line-height: 120%;
}
.drawer-opened header h1 span {
	color: #fff;
}
.humberger {
	width: 50px;
	padding-top: 20px;
	transition: .3s;
	margin: 0 0 0 auto;
	position: fixed;
	z-index: 2;
	right: 0;
	text-align: center;
}
#drawernav {
	position: fixed;
	width: 100%;
	height: 1000px;
	background-color: rgba(0,0,0,0.9);
	;
	color: #fff;
	z-index: 1;
	transition: .3s;
	opacity: 0;
	left: 0;
	visibility: hidden;
}
#drawernav ul {
	padding: 100px 0 0;
}
#drawernav li {
	width: 48%;
	float: left;
	margin: 0 4% 25px 0;
}
#drawernav li:nth-child(2n) {
	margin-right: 0;
}
#drawernav li .img {
	overflow: hidden;
	margin-bottom: 10px;
}
#drawernav li a {
	display: block;
}
#drawernav li a img {
	transition: .3s;
}
#drawernav li a:hover img {
	transform: scale(1.05);
	-webkit-backface-visibility: hidden;
	backface-visibility: hidden;
}
#drawernav li h3 {
	font-size: 14px;
	color: #fff;
	text-align: center;
	font-weight: normal;
}
#drawernav li h3 span {
	display: block;
	font-size: 12px;
	padding-top: 5px;
}
.drawer-opened .humberger {
	z-index: 1;
}
.drawer-opened #drawernav {
	opacity: 1;
	visibility: visible;
}
.icon-bar {
	width: 30px;
	height: 3px;
	margin: 0 auto 7px;
	display: block;
	background-color: #333333;
	transition: .3s;
}
#drawernav .icon-bar {
	background-color: #fff;
}
.icon-name {
	color: #907927;
	font-weight: bold;
	font-family: 'Oswald', sans-serif;
}
#drawernav .humberger {
	text-align: right;
	display: block;
	position: inherit;
	right: 0;
	background-color: transparent;
	padding: 27px 0 0;
}
#drawernav .humberger :nth-child(1) {
	transform: translate(0, 5px) rotate(45deg);
	-webkit-transform: translate(0, 5px) rotate(45deg);
}
#drawernav .humberger :nth-child(2) {
	transform: translate(0, -5px) rotate(-45deg);
	-webkit-transform: translate(0, -5px) rotate(-45deg);
}

<div class="humberger">
			<span class="icon-bar"></span>
			<span class="icon-bar"></span>
			<span class="icon-bar"></span>
		</div>
		<div  id="drawernav">
			<div class="humberger">
				<span class="icon-bar"></span>
				<span class="icon-bar"></span>
			</div><!--humberger-->
			<ul>
				<li><a href="#test">メニュー</a></li>
				<li><a href="#test">メニュー</a></li>
				<li><a href="#test">メニュー</a></li>
				<li><a href="#test">メニュー</a></li>
			</ul>
			</div>

$(function(){
        $(".humberger").on("click", function() {
            $("body").toggleClass("drawer-opened");//追加部分
        });
    });