diff --git a/yt_dlp/extractor/extractors.py b/yt_dlp/extractor/extractors.py
index e18d849fb..0b6ba5969 100644
--- a/yt_dlp/extractor/extractors.py
+++ b/yt_dlp/extractor/extractors.py
@@ -1119,6 +1119,7 @@ from .safari import (
     SafariApiIE,
     SafariCourseIE,
 )
+from .saitosan import SaitosanIE
 from .samplefocus import SampleFocusIE
 from .sapo import SapoIE
 from .savefrom import SaveFromIE
diff --git a/yt_dlp/extractor/saitosan.py b/yt_dlp/extractor/saitosan.py
new file mode 100644
index 000000000..621335ca0
--- /dev/null
+++ b/yt_dlp/extractor/saitosan.py
@@ -0,0 +1,78 @@
+# coding: utf-8
+
+from __future__ import unicode_literals
+
+from .common import InfoExtractor
+from ..utils import ExtractorError, try_get
+
+
+class SaitosanIE(InfoExtractor):
+    IE_NAME = 'Saitosan'
+    _VALID_URL = r'https?://(?:www\.)?saitosan\.net/bview.html\?id=(?P<id>[0-9]+)'
+    _TESTS = [{
+        'url': 'http://www.saitosan.net/bview.html?id=10031846',
+        'info_dict': {
+            'id': '10031846',
+            'ext': 'mp4',
+            'title': '井下原 和弥',
+            'uploader': '井下原 和弥',
+            'thumbnail': 'http://111.171.196.85:8088/921f916f-7f55-4c97-b92e-5d9d0fef8f5f/thumb',
+            'is_live': True,
+        },
+        'params': {
+            # m3u8 download
+            'skip_download': True,
+        },
+        'skip': 'Broadcasts are ephemeral',
+    },
+        {
+        'url': 'http://www.saitosan.net/bview.html?id=10031795',
+        'info_dict': {
+            'id': '10031795',
+            'ext': 'mp4',
+            'title': '橋本',
+            'uploader': '橋本',
+            'thumbnail': 'http://111.171.196.85:8088/1a3933e1-a01a-483b-8931-af15f37f8082/thumb',
+            'is_live': True,
+        },
+        'params': {
+            # m3u8 download
+            'skip_download': True,
+        },
+        'skip': 'Broadcasts are ephemeral',
+    }]
+
+    def _real_extract(self, url):
+        b_id = self._match_id(url)
+
+        base = 'http://hankachi.saitosan-api.net:8002/socket.io/?transport=polling&EIO=3'
+        sid = self._download_socket_json(base, b_id, note='Opening socket').get('sid')
+        base += '&sid=' + sid
+
+        self._download_webpage(base, b_id, note='Polling socket')
+        payload = '420["room_start_join",{"room_id":"%s"}]' % b_id
+        payload = '%s:%s' % (len(payload), payload)
+
+        self._download_webpage(base, b_id, data=payload, note='Polling socket with payload')
+        response = self._download_socket_json(base, b_id, note='Polling socket')
+        if not response.get('ok'):
+            err = response.get('error') or {}
+            raise ExtractorError(
+                '%s said: %s - %s' % (self.IE_NAME, err.get('code', '?'), err.get('msg', 'Unknown')) if err
+                else 'The socket reported that the broadcast could not be joined. Maybe it\'s offline or the URL is incorrect',
+                expected=True, video_id=b_id)
+
+        self._download_webpage(base, b_id, data='26:421["room_finish_join",{}]', note='Polling socket')
+        b_data = self._download_socket_json(base, b_id, note='Getting broadcast metadata from socket')
+        m3u8_url = b_data.get('url')
+
+        self._download_webpage(base, b_id, data='1:1', note='Closing socket', fatal=False)
+
+        return {
+            'id': b_id,
+            'title': b_data.get('name'),
+            'formats': self._extract_m3u8_formats(m3u8_url, b_id, 'mp4', live=True),
+            'thumbnail': m3u8_url.replace('av.m3u8', 'thumb'),
+            'uploader': try_get(b_data, lambda x: x['broadcast_user']['name']),  # same as title
+            'is_live': True
+        }