Stylus CSS to convert Mieryo -> Noto Sans CJK JP. Stylus : https://chrome.google.com/webstore/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne

default.css

@font-face {
 font-family: 'sans-serif';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Meiryo';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Meiryo UI';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'ＭＳ Ｐゴシック';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'MS Mincho';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'メイリオ';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Helvetica';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Arial';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Roboto';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Poiret One';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'cursive';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Source Sans Pro';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'wf_segoe-ui_normal';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'wf_segoe-ui_semilight';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'wf_segoe-ui_light';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Segoe UI';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'SegoeUI';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Yu Gothic UI';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Meiryo UI';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}

@font-face {
 font-family: 'Roboto';
 src: local("Noto Sans CJK JP"),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff2) format('woff2'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.woff) format('woff'),
 url(//fonts.gstatic.com/ea/notosansjp/v5/NotoSansJP-Regular.otf) format('opentype');
}