diff --git a/app/logical/nico_seiga_manga_api_client.rb b/app/logical/nico_seiga_manga_api_client.rb
index 7649dd139..a33263e65 100644
--- a/app/logical/nico_seiga_manga_api_client.rb
+++ b/app/logical/nico_seiga_manga_api_client.rb
@@ -1,6 +1,6 @@
 class NicoSeigaMangaApiClient
   extend Memoist
-  BASE_URL = "http://seiga.nicovideo.jp/api"
+  BASE_URL = "https://seiga.nicovideo.jp/api"
   attr_reader :theme_id
 
   def initialize(theme_id)
@@ -24,7 +24,9 @@ class NicoSeigaMangaApiClient
   end
 
   def image_ids
-    theme_data_xml["response"]["image_list"]["image"].map {|x| x["id"]}
+    images = theme_data_xml["response"]["image_list"]["image"]
+    images = [images] unless images.is_a?(Array)
+    images.map {|x| x["id"]}
   end
 
   def tags
diff --git a/app/logical/sources/strategies.rb b/app/logical/sources/strategies.rb
index b8bdba71a..e2294e643 100644
--- a/app/logical/sources/strategies.rb
+++ b/app/logical/sources/strategies.rb
@@ -3,7 +3,6 @@ module Sources
     def self.all
       return [
         Strategies::Pixiv, 
-        Strategies::NicoSeigaManga, # must come before NicoSeiga
         Strategies::NicoSeiga,
         Strategies::Twitter, 
         Strategies::Stash, # must come before DeviantArt
diff --git a/app/logical/sources/strategies/nico_seiga.rb b/app/logical/sources/strategies/nico_seiga.rb
index d62cadf5e..78b218e2e 100644
--- a/app/logical/sources/strategies/nico_seiga.rb
+++ b/app/logical/sources/strategies/nico_seiga.rb
@@ -4,8 +4,10 @@ module Sources
       URL = %r!\Ahttps?://(?:\w+\.)?nico(?:seiga|video)\.jp!
       DIRECT1 = %r!\Ahttps?://lohas\.nicoseiga\.jp/priv/[0-9a-f]+!
       DIRECT2 = %r!\Ahttps?://lohas\.nicoseiga\.jp/o/[0-9a-f]+/\d+/\d+!
+      DIRECT3 = %r!\Ahttps?://seiga\.nicovideo\.jp/images/source/\d+!
       PAGE = %r!\Ahttps?://seiga\.nicovideo\.jp/seiga/im(\d+)!i
       PROFILE = %r!\Ahttps?://seiga\.nicovideo\.jp/user/illust/(\d+)!i
+      MANGA_PAGE = %r!\Ahttps?://seiga\.nicovideo\.jp/watch/mg(\d+)!i
 
       def domains
         ["nicoseiga.jp", "nicovideo.jp"]
@@ -20,6 +22,12 @@ module Sources
           return [url]
         end
 
+        if theme_id
+          return api_client.image_ids.map do |image_id|
+            "https://seiga.nicovideo.jp/image/source/#{image_id}"
+          end
+        end
+
         link = page.search("a#illust_link")
 
         if link.any?
@@ -65,6 +73,10 @@ module Sources
           if x =~ %r{/seiga/im\d+}
             return x
           end
+
+          if x =~ %r{/watch/mg\d+}
+            return x
+          end
         end
 
         return super
@@ -105,7 +117,7 @@ module Sources
       end
 
       def normalizable_for_artist_finder?
-        url =~ PAGE || url =~ PROFILE || url =~ DIRECT1 || url =~ DIRECT2
+        url =~ PAGE || url =~ MANGA_PAGE || url =~ PROFILE || url =~ DIRECT1 || url =~ DIRECT2
       end
 
       def normalize_for_artist_finder
@@ -127,7 +139,11 @@ module Sources
     public
 
       def api_client
-        NicoSeigaApiClient.new(illust_id: illust_id)
+        if illust_id
+          NicoSeigaApiClient.new(illust_id: illust_id)
+        elsif theme_id
+          NicoSeigaMangaApiClient.new(theme_id)
+        end
       end
       memoize :api_client
 
@@ -139,6 +155,14 @@ module Sources
         return nil
       end
 
+      def theme_id
+        if page_url =~ MANGA_PAGE
+          return $1.to_i
+        end
+
+        return nil
+      end
+
       def page
         doc = agent.get(page_url)
 
diff --git a/app/logical/sources/strategies/nico_seiga_manga.rb b/app/logical/sources/strategies/nico_seiga_manga.rb
deleted file mode 100644
index 59705fc8a..000000000
--- a/app/logical/sources/strategies/nico_seiga_manga.rb
+++ /dev/null
@@ -1,71 +0,0 @@
-module Sources
-  module Strategies
-    class NicoSeigaManga < Base
-      PAGE_URL = %r!\Ahttps?://seiga\.nicovideo\.jp/watch/mg(\d+)!i
-
-      def domains
-        ["nicoseiga.jp", "nicovideo.jp"]
-      end
-
-      def site_name
-        "Nico Seiga (manga)"
-      end
-
-      def image_urls       
-        api_client.image_ids.map do |image_id|
-          "https://seiga.nicovideo.jp/image/source/#{image_id}"
-        end
-      end
-
-      def page_url
-        [url, referer_url].each do |x|
-          if x =~ PAGE_URL
-            return x
-          end
-        end
-
-        return super
-      end
-
-      def canonical_url
-        image_url
-      end
-
-      def profile_url
-        if url =~ PROFILE
-          return url
-        end
-
-        "http://seiga.nicovideo.jp/user/illust/#{api_client.user_id}"
-      end
-
-      def artist_name
-        api_client.moniker
-      end
-
-      def artist_commentary_title
-        api_client.title
-      end
-
-      def artist_commentary_desc
-        api_client.desc
-      end
-
-      def headers
-        super.merge(
-          "Referer" => "https://seiga.nicovideo.jp"
-        )
-      end
-      
-      def theme_id
-        if page_url =~ PAGE_URL
-          return $1
-        end
-      end
-
-      def api_client
-        NicoSeigaMangaApiClient.new(theme_id)
-      end
-    end
-  end
-end