diff --git a/app/logical/sources/strategies/base.rb b/app/logical/sources/strategies/base.rb
index 356b704ca..3b0ec8096 100644
--- a/app/logical/sources/strategies/base.rb
+++ b/app/logical/sources/strategies/base.rb
@@ -87,7 +87,7 @@ module Sources
 
       # Given a tag from the source site, should return an array of corresponding Danbooru tags.
       def translate_tag(untranslated_tag)
-        translated_tags = Tag.where(name: WikiPage.active.other_names_equal([untranslated_tag]).uniq.select(:title))
+        translated_tags = Tag.where(name: WikiPage.active.other_names_equal(untranslated_tag).uniq.select(:title))
 
         if translated_tags.empty?
           normalized_name = TagAlias.to_aliased([Tag.normalize_name(untranslated_tag)])
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 60ead6b08..28c3e399d 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -45,8 +45,8 @@ class WikiPage < ApplicationRecord
       end
     end
 
-    def other_names_equal(names)
-      query_sql = names.map(&:to_escaped_for_tsquery).join(" | ")
+    def other_names_equal(name)
+      query_sql = name.unicode_normalize(:nfkc).to_escaped_for_tsquery
       where("other_names_index @@ to_tsquery('danbooru', E?)", query_sql)
     end
 
@@ -55,7 +55,7 @@ class WikiPage < ApplicationRecord
         subquery = WikiPage.from("unnest(string_to_array(other_names, ' ')) AS other_name").where("other_name ILIKE ?", name.to_escaped_for_sql_like)
         where(id: subquery)
       else
-        other_names_equal([name])
+        other_names_equal(name)
       end
     end
 
diff --git a/test/unit/sources/nijie_test.rb b/test/unit/sources/nijie_test.rb
index 6e1528116..c2379710b 100644
--- a/test/unit/sources/nijie_test.rb
+++ b/test/unit/sources/nijie_test.rb
@@ -4,6 +4,9 @@ module Sources
   class NijieTest < ActiveSupport::TestCase
     context "The source site for a nijie page" do
       setup do
+        CurrentUser.user = FactoryGirl.create(:user)
+        CurrentUser.ip_addr = "127.0.0.1"
+
         @site = Sources::Site.new("http://nijie.info/view.php?id=213043")
         @site.get
       end
@@ -24,6 +27,17 @@ module Sources
         assert_equal([["眼鏡", "http://nijie.info/search.php?word=%E7%9C%BC%E9%8F%A1"], ["リトルウィッチアカデミア", "http://nijie.info/search.php?word=%E3%83%AA%E3%83%88%E3%83%AB%E3%82%A6%E3%82%A3%E3%83%83%E3%83%81%E3%82%A2%E3%82%AB%E3%83%87%E3%83%9F%E3%82%A2"], ["アーシュラ先生", "http://nijie.info/search.php?word=%E3%82%A2%E3%83%BC%E3%82%B7%E3%83%A5%E3%83%A9%E5%85%88%E7%94%9F"]], @site.tags)
       end
 
+      should "normalize （）characters in tags" do
+        FactoryGirl.create(:tag, :name => "kaga")
+        FactoryGirl.create(:wiki_page, :title => "kaga", :other_names => "加賀(艦これ)")
+
+        @site = Sources::Site.new("http://nijie.info/view.php?id=208316")
+        @site.get
+
+        assert_includes(@site.tags.map(&:first), "加賀（艦これ）")
+        assert_includes(@site.translated_tags.map(&:first), "kaga")
+      end
+
       should "get the commentary" do
         title = "ジャージの下は"
         desc = "「リトルウィッチアカデミア」から無自覚サキュバスぶりを発揮するアーシュラ先生です"