diff --git a/app/logical/source/url.rb b/app/logical/source/url.rb
index b6612906d..11cca3406 100644
--- a/app/logical/source/url.rb
+++ b/app/logical/source/url.rb
@@ -28,6 +28,7 @@ module Source
       Source::URL::Moebooru,
       Source::URL::Nijie,
       Source::URL::Newgrounds,
+      Source::URL::PixivSketch,
       Source::URL::Plurk,
       Source::URL::Skeb,
       Source::URL::TwitPic,
diff --git a/app/logical/source/url/pixiv_sketch.rb b/app/logical/source/url/pixiv_sketch.rb
new file mode 100644
index 000000000..526d31f06
--- /dev/null
+++ b/app/logical/source/url/pixiv_sketch.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Source
+  class URL::PixivSketch < Source::URL
+    attr_reader :work_id, :username, :full_image_url
+
+    def self.match?(url)
+      url.host.in?(%w[sketch.pixiv.net img-sketch.pixiv.net img-sketch.pximg.net])
+    end
+
+    def parse
+      case [host, *path_segments]
+
+      # https://sketch.pixiv.net/items/5835314698645024323
+      in "sketch.pixiv.net", "items", work_id
+        @work_id = work_id
+
+      # https://img-sketch.pixiv.net/uploads/medium/file/4463372/8906921629213362989.jpg (page: https://sketch.pixiv.net/items/5835314698645024323)
+      # https://img-sketch.pximg.net/c!/w=540,f=webp:jpeg/uploads/medium/file/4463372/8906921629213362989.jpg
+      # https://img-sketch.pixiv.net/c/f_540/uploads/medium/file/9986983/8431631593768139653.jpg
+      in *, "uploads", "medium", "file", dir, file if image_url?
+        @full_image_url = "https://img-sketch.pixiv.net/uploads/medium/file/#{dir}/#{file}"
+
+      # https://sketch.pixiv.net/@user_ejkv8372
+      # https://sketch.pixiv.net/@user_ejkv8372/followings
+      in "sketch.pixiv.net", /^@/ => username, *rest
+        @username = username.delete_prefix("@")
+
+      else
+      end
+    end
+
+    def image_url?
+      url.host.in?(%w[img-sketch.pixiv.net img-sketch.pximg.net])
+    end
+
+    def page_url
+      # https://sketch.pixiv.net/items/5835314698645024323
+      "https://sketch.pixiv.net/items/#{work_id}" if work_id.present?
+    end
+
+    def api_url
+      # https://sketch.pixiv.net/api/items/5835314698645024323.json (won't work in the browser; use curl)
+      "https://sketch.pixiv.net/api/items/#{work_id}.json" if work_id.present?
+    end
+  end
+end
diff --git a/app/logical/sources/strategies.rb b/app/logical/sources/strategies.rb
index 105fb6062..2f949c1fc 100644
--- a/app/logical/sources/strategies.rb
+++ b/app/logical/sources/strategies.rb
@@ -16,6 +16,7 @@ module Sources
         Strategies::HentaiFoundry,
         Strategies::Fanbox,
         Strategies::Mastodon,
+        Strategies::PixivSketch,
         Strategies::Weibo,
         Strategies::Newgrounds,
         Strategies::Skeb,
diff --git a/app/logical/sources/strategies/pixiv.rb b/app/logical/sources/strategies/pixiv.rb
index 7cc714ed2..88b77f0d5 100644
--- a/app/logical/sources/strategies/pixiv.rb
+++ b/app/logical/sources/strategies/pixiv.rb
@@ -88,16 +88,12 @@ module Sources
       def match?
         return false if parsed_url.nil?
         return false if url.include? "/fanbox/"
+        return false if Source::URL::PixivSketch === parsed_url
         parsed_url.domain.in?(domains) || parsed_url.host == "tc-pximg01.techorus-cdn.com"
       end
 
       def site_name
-        # XXX pixiv sketch should be in a separate strategy
-        if parsed_url.host.in?(%w[sketch.pixiv.net img-sketch.pixiv.net img-sketch.pximg.net])
-          "Pixiv Sketch"
-        else
-          "Pixiv"
-        end
+        "Pixiv"
       end
 
       def image_urls
diff --git a/app/logical/sources/strategies/pixiv_sketch.rb b/app/logical/sources/strategies/pixiv_sketch.rb
new file mode 100644
index 000000000..9b8601be8
--- /dev/null
+++ b/app/logical/sources/strategies/pixiv_sketch.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+# @see Source::URL::PixivSketch
+module Sources
+  module Strategies
+    class PixivSketch < Base
+      extend Memoist
+
+      def match?
+        Source::URL::PixivSketch === parsed_url
+      end
+
+      def site_name
+        parsed_url.site_name
+      end
+
+      def image_urls
+        if parsed_url.image_url?
+          [parsed_url.full_image_url]
+        else
+          image_urls_from_api
+        end
+      end
+
+      def image_urls_from_api
+        api_response.dig("data", "media").to_a.pluck("photo").pluck("original").pluck("url2x")
+      end
+
+      def profile_url
+        "https://sketch.pixiv.net/@#{artist_name}" if artist_name.present?
+      end
+
+      def artist_name
+        api_response.dig("data", "user", "unique_name")
+      end
+
+      def other_names
+        [artist_name, display_name].compact
+      end
+
+      def profile_urls
+        [profile_url, pixiv_profile_url].compact
+      end
+
+      def artist_commentary_desc
+        api_response.dig("data", "text")
+      end
+
+      def tags
+        api_response.dig("data", "tags").to_a.map do |tag|
+          [tag, "https://sketch.pixiv.net/tags/#{tag}"]
+        end
+      end
+
+      def display_name
+        api_response.dig("data", "user", "name")
+      end
+
+      def pixiv_profile_url
+        "https://www.pixiv.net/users/#{pixiv_user_id}" if pixiv_user_id.present?
+      end
+
+      def pixiv_user_id
+        api_response.dig("data", "user", "pixiv_user_id")
+      end
+
+      # curl https://sketch.pixiv.net/api/items/5835314698645024323.json | jq
+      def api_response
+        return {} if api_url.blank?
+
+        response = http.cache(1.minute).get(api_url)
+        return {} if response.status == 404
+
+        response.parse
+      end
+
+      def page_url
+        parsed_url.page_url || parsed_referer&.page_url
+      end
+
+      def api_url
+        parsed_url.api_url || parsed_referer&.api_url
+      end
+
+      memoize :api_response
+    end
+  end
+end
diff --git a/test/functional/uploads_controller_test.rb b/test/functional/uploads_controller_test.rb
index dcbf0152b..01900ef92 100644
--- a/test/functional/uploads_controller_test.rb
+++ b/test/functional/uploads_controller_test.rb
@@ -318,6 +318,8 @@ class UploadsControllerTest < ActionDispatch::IntegrationTest
         should_upload_successfully("https://www.pixiv.net/member_illust.php?mode=medium&illust_id=62247364")
         should_upload_successfully("https://i.pximg.net/img-original/img/2017/08/18/00/09/21/64476642_p0.jpg")
 
+        should_upload_successfully("https://sketch.pixiv.net/items/5835314698645024323")
+
         should_upload_successfully("https://noizave.tumblr.com/post/162206271767")
         should_upload_successfully("https://media.tumblr.com/3bbfcbf075ddf969c996641b264086fd/tumblr_os2buiIOt51wsfqepo1_1280.png")
 
diff --git a/test/unit/sources/pixiv_sketch_test.rb b/test/unit/sources/pixiv_sketch_test.rb
new file mode 100644
index 000000000..8da37f8ff
--- /dev/null
+++ b/test/unit/sources/pixiv_sketch_test.rb
@@ -0,0 +1,140 @@
+require 'test_helper'
+
+module Sources
+  class PixivSketchTest < ActiveSupport::TestCase
+    context "A Pixiv Sketch source" do
+      should "work for a post with a single image" do
+        source = Sources::Strategies.find("https://sketch.pixiv.net/items/5835314698645024323")
+
+        assert_equal("Pixiv Sketch", source.site_name)
+        assert_equal(["https://img-sketch.pixiv.net/uploads/medium/file/9986983/8431631593768139653.jpg"], source.image_urls)
+        assert_equal("https://sketch.pixiv.net/items/5835314698645024323", source.page_url)
+        assert_equal("https://sketch.pixiv.net/items/5835314698645024323", source.canonical_url)
+        assert_equal("https://sketch.pixiv.net/@user_ejkv8372", source.profile_url)
+        assert_equal(["https://sketch.pixiv.net/@user_ejkv8372", "https://www.pixiv.net/users/44772126"], source.profile_urls)
+        assert_equal("user_ejkv8372", source.artist_name)
+        assert_equal(["user_ejkv8372", "サコ"], source.other_names)
+        assert_equal("🍻シャンクスとミホーク誕生日おめでとう🍻（過去絵） ", source.artist_commentary_desc)
+        assert_equal([], source.tags.map(&:first))
+        assert_nothing_raised { source.to_h }
+      end
+
+      should "work for an image url without a referer" do
+        # page: https://sketch.pixiv.net/items/8052785510155853613
+        source = Sources::Strategies.find("https://img-sketch.pixiv.net/uploads/medium/file/9988973/7216948861306830496.jpg")
+
+        assert_equal(["https://img-sketch.pixiv.net/uploads/medium/file/9988973/7216948861306830496.jpg"], source.image_urls)
+        assert_nil(source.page_url)
+        assert_equal(source.url, source.canonical_url)
+        assert_nil(source.profile_url)
+        assert_equal([], source.profile_urls)
+        assert_nil(source.artist_name)
+        assert_equal([], source.other_names)
+        assert_nil(source.artist_commentary_desc)
+        assert_equal([], source.tags.map(&:first))
+        assert_nothing_raised { source.to_h }
+      end
+
+      should "work for an image url with a referer" do
+        source = Sources::Strategies.find("https://img-sketch.pixiv.net/uploads/medium/file/9988973/7216948861306830496.jpg", "https://sketch.pixiv.net/items/8052785510155853613")
+
+        assert_equal("https://sketch.pixiv.net/items/8052785510155853613", source.page_url)
+        assert_equal("https://sketch.pixiv.net/items/8052785510155853613", source.canonical_url)
+        assert_equal("https://sketch.pixiv.net/@op-one", source.profile_url)
+        assert_equal(["https://sketch.pixiv.net/@op-one", "https://www.pixiv.net/users/5903369"], source.profile_urls)
+        assert_equal("op-one", source.artist_name)
+        assert_equal(["op-one", "俺P１号"], source.other_names)
+        assert_match(/\A3月3日は「うさぎの日」らしいので/, source.artist_commentary_desc)
+        assert_equal(%w[制作過程 このすば この素晴らしい世界に祝福を セナ バニー 3月3日 巨乳 黒髪巨乳 タイツ], source.tags.map(&:first))
+        assert_nothing_raised { source.to_h }
+      end
+
+      should "work for a NSFW post" do
+        source = Sources::Strategies.find("https://sketch.pixiv.net/items/193462611994864256")
+
+        assert_equal(["https://img-sketch.pixiv.net/uploads/medium/file/884876/4909517173982299587.jpg"], source.image_urls)
+        assert_equal("https://sketch.pixiv.net/items/193462611994864256", source.page_url)
+        assert_equal("https://sketch.pixiv.net/items/193462611994864256", source.canonical_url)
+        assert_equal("https://sketch.pixiv.net/@lithla", source.profile_url)
+        assert_equal(["https://sketch.pixiv.net/@lithla", "https://www.pixiv.net/users/4957"], source.profile_urls)
+        assert_equal("lithla", source.artist_name)
+        assert_equal(["lithla", "リリスラウダ"], source.other_names)
+        assert_equal("チビッコ露出プレイ ピース", source.artist_commentary_desc)
+        assert_equal([], source.tags.map(&:first))
+        assert_nothing_raised { source.to_h }
+      end
+
+      should "work for a post with a multiple images" do
+        source = Sources::Strategies.find("https://sketch.pixiv.net/items/8052785510155853613")
+
+        assert_equal(%w[
+          https://img-sketch.pixiv.net/uploads/medium/file/9988964/1564052114639195387.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988965/3187185972065199018.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988966/5281789458380074490.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988967/8187710652175488805.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988968/3497441770651131427.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988969/1770110164450415039.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988970/1340350233137289970.png
+          https://img-sketch.pixiv.net/uploads/medium/file/9988971/9105451079763734305.jpg
+          https://img-sketch.pixiv.net/uploads/medium/file/9988972/2641925439408057307.jpg
+          https://img-sketch.pixiv.net/uploads/medium/file/9988973/7216948861306830496.jpg
+        ], source.image_urls)
+        assert_equal("https://sketch.pixiv.net/items/8052785510155853613", source.page_url)
+        assert_equal("https://sketch.pixiv.net/items/8052785510155853613", source.canonical_url)
+        assert_equal("https://sketch.pixiv.net/@op-one", source.profile_url)
+        assert_equal("op-one", source.artist_name)
+        assert_equal(<<~EOS.normalize_whitespace, source.artist_commentary_desc)
+          3月3日は「うさぎの日」らしいので
+
+
+          ▼制作過程
+          ◎制作過程
+          ①ﾗﾌｺﾝﾃ(ｱﾀﾘ)
+          ②ﾗﾌｺﾝﾃ(ﾗﾌﾒﾓ)
+          ③ｺﾝﾃ(ﾍﾞｸﾄﾙﾗﾌ)+色ｱﾀﾘ
+          ④1原(ﾗﾌ原)
+          ⑤1原(ﾗﾌ原)(線のみ)
+          ⑥色ﾗﾌ
+          ⑦仕上げ⇒完成
+          ⑨完成(ｾﾋﾟｱﾓﾉﾄｰﾝ)
+          ⑧完成(ｸﾞﾚｰﾓﾉｸﾛ)
+
+          色までつける時間と心の余裕が無いのでモノクロでらくがき
+          それでも5時間ぐらいかかってる(③～④の間で30分ぐらい雑務)
+
+          やっぱﾗﾌから１原は時間かかる…
+          ・線画だけから立体が把握できない(頭の中で3D化できない)
+          ・描き続けてると立体感がゲシュタルト崩壊する
+          ・目のピントが合わない
+          ので1～2回休憩して目と頭休ませないといけないのがきつい
+          目と頭のスタミナ不足は如何ともしがたい
+
+          線画のみから感覚的に立体把握できる「確かめ算」みたいな手法を練りこむ必要がある…のはわかってるけど
+          「断面図」
+          「透明な板を設定して奥行きパース確認」
+          「地面に正方形を描いて縦パース確認」
+          「関節部や胴体中央部に核(丸)を描いて立体確認」
+          「線画」を淡く表示し上から簡単な立体モデルを描いてみて「大きさ比率の確認」
+          …ぐらいかな思いつくのは
+
+          あと初期に足首の関節素体描いて立体把握してる跡がある
+          いまだに関節の軸を足首のドコに設定すれば自然に見えるか迷う
+          多分最大に伸ばしたり曲げたりしてるときは関節浮いてたりするんだろうから簡単な軸設定だと違和感が出てくるんだとは思う
+
+          #制作過程
+          #このすば
+          #この素晴らしい世界に祝福を！
+          #セナ
+          #バニー
+          #3月3日
+          #巨乳
+          #黒髪巨乳
+          #タイツ
+        EOS
+
+        assert_equal(%w[制作過程 このすば この素晴らしい世界に祝福を セナ バニー 3月3日 巨乳 黒髪巨乳 タイツ], source.tags.map(&:first))
+        assert_nothing_raised { source.to_h }
+      end
+    end
+  end
+end
diff --git a/test/unit/sources/pixiv_test.rb b/test/unit/sources/pixiv_test.rb
index 017ad8060..dbe3cd8fb 100644
--- a/test/unit/sources/pixiv_test.rb
+++ b/test/unit/sources/pixiv_test.rb
@@ -344,12 +344,6 @@ module Sources
           assert_illust_id(46323924, "http://i1.pixiv.net/img-zip-ugoira/img/2014/10/03/17/29/16/46323924_ugoira1920x1080.zip")
         end
 
-        should "not misparse ids from sketch urls" do
-          assert_nil_illust_id("https://img-sketch.pixiv.net/uploads/medium/file/4463372/8906921629213362989.jpg")
-          assert_nil_illust_id("https://img-sketch.pximg.net/c!/w=540,f=webp:jpeg/uploads/medium/file/4463372/8906921629213362989.jpg")
-          assert_nil_illust_id("https://sketch.pixiv.net/items/1588346448904706151")
-        end
-
         should "not misparse ids from novel urls" do
           assert_nil_illust_id("https://i.pximg.net/novel-cover-original/img/2019/01/14/01/15/05/10617324_d84daae89092d96bbe66efafec136e42.jpg")
           assert_nil_illust_id("https://i.pximg.net/c/600x600/novel-cover-master/img/2019/01/14/01/15/05/10617324_d84daae89092d96bbe66efafec136e42_master1200.jpg")