diff --git a/backend/app/services/youtube/api_client.rb b/backend/app/services/youtube/api_client.rb
index 0f81eb8..e572b6f 100644
--- a/backend/app/services/youtube/api_client.rb
+++ b/backend/app/services/youtube/api_client.rb
@@ -11,14 +11,17 @@ module Youtube
       @api_key = api_key
     end
 
-    def search_videos q:, published_after:, page_token: nil
+    def search_videos q:, published_after: nil, published_before: nil, page_token: nil
       get_json('/search', {
           part:           'snippet',
           type:           'video',
-          q:              q,
+          q:,
           order:          'date',
           maxResults:     50,
-          publishedAfter: published_after.iso8601,
+          regionCode:     'JP',
+          relevanceLanguage: 'ja',
+          publishedAfter: published_after&.iso8601,
+          publishedBefore: published_before&.iso8601,
           pageToken:      page_token }.compact)
     end
 
@@ -37,6 +40,8 @@ module Youtube
     end
 
     def channel id: nil, handle: nil
+      raise ArgumentError, 'id or handle is required' if id.present? == handle.present?
+
       params = { part: 'snippet,contentDetails' }
       params[:id] = id if id
       params[:forHandle] = handle if handle
diff --git a/backend/app/services/youtube/sync.rb b/backend/app/services/youtube/sync.rb
index da8dc88..2056dc2 100644
--- a/backend/app/services/youtube/sync.rb
+++ b/backend/app/services/youtube/sync.rb
@@ -35,9 +35,10 @@ module Youtube
       end
 
       playlist_ids.each do |playlist_id|
-        response = @client.playlist_items(playlist_id:)
-        response.fetch('items', []).each do |item|
+        each_playlist_item(playlist_id) do |item|
           video_id = item.dig('contentDetails', 'videoId')
+          video_id ||= item.dig('snippet', 'resourceId', 'videoId')
+
           ids << video_id if video_id.present?
         end
       end
@@ -70,7 +71,7 @@ module Youtube
             title: video.title,
             url: video.url,
             thumbnail_base: video.thumbnail_url,
-            uploaded_user: nil,
+            uploaded_user_id: nil,
             original_created_from:,
             original_created_before:)
 
@@ -84,6 +85,7 @@ module Youtube
 
       deerjikist = Deerjikist.find_by(platform: :youtube, code: video.channel_id)
       if deerjikist
+        desired_tag_ids.delete(Tag.no_deerjikist.id)
         desired_tag_ids << deerjikist.tag_id
       elsif post.tags.where(category: :deerjikist).none?
         desired_tag_ids << Tag.no_deerjikist.id
@@ -147,5 +149,20 @@ module Youtube
     end
 
     def sync_since = 14.days.ago
+
+    def each_playlist_item playlist_id
+      page_token = nil
+
+      loop do
+        response = @client.playlist_items(playlist_id:, page_token:)
+
+        response.fetch('items', []).each do |item|
+          yield item
+        end
+
+        page_token = response['nextPageToken']
+        break if page_token.blank?
+      end
+    end
   end
 end
diff --git a/backend/app/services/youtube/video_item.rb b/backend/app/services/youtube/video_item.rb
index b8bad47..fea2b15 100644
--- a/backend/app/services/youtube/video_item.rb
+++ b/backend/app/services/youtube/video_item.rb
@@ -1,3 +1,6 @@
+require 'time'
+
+
 module Youtube
   class VideoItem
     attr_reader :id, :title, :channel_id, :published_at, :thumbnail_url, :raw_tags