diff --git a/yt_dlp/extractor/_extractors.py b/yt_dlp/extractor/_extractors.py
index 967010826e..cf8257318b 100644
--- a/yt_dlp/extractor/_extractors.py
+++ b/yt_dlp/extractor/_extractors.py
@@ -1450,6 +1450,7 @@
     OnetPlIE,
 )
 from .onionstudios import OnionStudiosIE
+from .onsen import OnsenIE
 from .opencast import (
     OpencastIE,
     OpencastPlaylistIE,
diff --git a/yt_dlp/extractor/onsen.py b/yt_dlp/extractor/onsen.py
new file mode 100644
index 0000000000..029058ca78
--- /dev/null
+++ b/yt_dlp/extractor/onsen.py
@@ -0,0 +1,138 @@
+import base64
+import json
+
+from .common import InfoExtractor
+from ..utils import (
+    ExtractorError,
+    parse_qs,
+    str_or_none,
+    strip_or_none,
+)
+from ..utils.traversal import traverse_obj
+
+
+class OnsenIE(InfoExtractor):
+    IE_NAME = 'onsen'
+    IE_DESC = 'インターネットラジオステーション＜音泉＞'
+
+    _BASE_URL = 'https://www.onsen.ag/'
+    _HEADERS = {'Referer': _BASE_URL}
+    _NETRC_MACHINE = 'onsen'
+    _VALID_URL = r'https?://(?:(?:share|www)\.)onsen\.ag/program/(?P<id>[\w-]+)'
+    _TESTS = [{
+        'url': 'https://share.onsen.ag/program/onsenking?p=90&c=MTA0NjI',
+        'info_dict': {
+            'id': '10462',
+            'ext': 'm4a',
+            'title': '第SP回',
+            'cast': ['下野紘', '佐藤元', '守屋亨香'],
+            'description': 'md5:083c1eddf198694cd3cc83f4d5c03863',
+            'display_id': 'MTA0NjI=',
+            'http_headers': {'Referer': 'https://www.onsen.ag/'},
+            'media_type': 'sound',
+            'section_start': 0,
+            'series': '音泉キング「下野紘」のラジオ きみはもちろん、＜音泉＞ファミリーだよね？',
+            'series_id': 'onsenking',
+            'tags': ['音泉キング', '音泉ジュニア'],
+            'thumbnail': r're:https://d3bzklg4lms4gh\.cloudfront\.net/program_info/image/default/production/.+$',
+            'upload_date': '20220627',
+            'webpage_url': 'https://www.onsen.ag/program/onsenking?c=MTA0NjI=',
+        },
+    }, {
+        'url': 'https://share.onsen.ag/program/girls-band-cry-radio?p=370&c=MTgwMDE',
+        'info_dict': {
+            'id': '18001',
+            'ext': 'mp4',
+            'title': '第4回',
+            'cast': ['夕莉', '理名', '朱李', '凪都', '美怜'],
+            'description': 'md5:1d7f6a2f1f5a3e2a8ada4e9f652262dd',
+            'display_id': 'MTgwMDE=',
+            'http_headers': {'Referer': 'https://www.onsen.ag/'},
+            'media_type': 'movie',
+            'section_start': 0,
+            'series': 'TVアニメ『ガールズバンドクライ』WEBラジオ「ガールズバンドクライ～ラジオにも全部ぶち込め。～」',
+            'series_id': 'girls-band-cry-radio',
+            'tags': ['ガールズバンドクライ', 'ガルクラ', 'ガルクラジオ'],
+            'thumbnail': r're:https://d3bzklg4lms4gh\.cloudfront\.net/program_info/image/default/production/.+$',
+            'upload_date': '20240425',
+            'webpage_url': 'https://www.onsen.ag/program/girls-band-cry-radio?c=MTgwMDE=',
+        },
+        'skip': 'Only available for premium supporters',
+    }, {
+        'url': 'https://www.onsen.ag/program/g-witch',
+        'info_dict': {
+            'id': 'g-witch',
+            'title': '機動戦士ガンダム 水星の魔女～アスティカシア高等専門学園 ラジオ委員会～',
+        },
+        'playlist_mincount': 7,
+    }]
+
+    def _perform_login(self, username, password):
+        signin = self._download_json(
+            f'{self._BASE_URL}web_api/signin', None, 'Logging in', headers={
+                'content-type': 'application/json; charset=UTF-8',
+            }, data=json.dumps({
+                'session': {
+                    'email': username,
+                    'password': password,
+                },
+            }).encode(), expected_status=401)
+
+        if signin.get('error'):
+            raise ExtractorError('Invalid username or password', expected=True)
+
+    def _get_info(self, program, program_id, metadata):
+        m3u8 = program['streaming_url']
+        rd = self._search_regex(rf'{program_id}(\d{{6}})', m3u8, 'release_date', default=None)
+        display_id = base64.b64encode(str(program['id']).encode()).decode()
+
+        return {
+            'display_id': display_id,
+            'formats': self._extract_m3u8_formats(m3u8, program_id, headers=self._HEADERS),
+            'http_headers': self._HEADERS,
+            'upload_date': f'20{rd}' if rd else None,
+            'webpage_url': f'{self._BASE_URL}program/{program_id}?c={display_id}',
+            **metadata,
+            **traverse_obj(program, {
+                'id': ('id', {str_or_none}),
+                'title': ('title', {strip_or_none}),
+                'media_type': ('media_type', {str}),
+                'thumbnail': ('poster_image_url', {lambda x: x.split('?')[0]}),
+            }),
+            'cast': metadata['cast'] + traverse_obj(program, ('guests', ..., 'name', {str})),
+        }
+
+    def _real_extract(self, url):
+        program_id = self._match_id(url)
+        qs = {k: v[0] for k, v in parse_qs(url).items() if v}
+        programs = self._download_json(
+            f'{self._BASE_URL}web_api/programs/{program_id}', program_id)
+
+        metadata = {
+            'cast': traverse_obj(programs, ('performers', ..., 'name', {str})),
+            'section_start': int(qs.get('t', 0)),
+            'series_id': program_id,
+            **traverse_obj(programs['program_info'], {
+                'description': ('description', {str}),
+                'series': ('title', {str}),
+                'tags': ('hashtag_list', {list}),
+            }),
+        }
+
+        if 'c' in qs:
+            p_id = base64.b64decode(qs['c'] + '=' * (-len(qs['c']) % 4)).decode()
+            program = traverse_obj(
+                programs, ('contents', lambda _, v: v['id'] == int(p_id)), get_all=False)
+            if not program:
+                raise ExtractorError('This program is no longer available', expected=True)
+            if not program['streaming_url']:
+                self.raise_login_required('This program is only available for premium supporters')
+
+            return self._get_info(program, program_id, metadata)
+        else:
+            entries = [
+                self._get_info(program, program_id, metadata)
+                for program in programs['contents'] if program['streaming_url']
+            ]
+
+            return self.playlist_result(entries, program_id, metadata['series'])