diff --git a/backend/lib/tasks/link_nico.rake b/backend/lib/tasks/link_nico.rake
new file mode 100644
index 0000000..0c02f48
--- /dev/null
+++ b/backend/lib/tasks/link_nico.rake
@@ -0,0 +1,12 @@
+namespace :nico do
+  desc 'ニコタグ連携'
+  task link: :environment do
+    Post.find_each do |post|
+      tags = post.tags.where(category: 'nico')
+      tags.each do |tag|
+        post.tags.concat(tag.linked_tags) if tag.linked_tags.present?
+      end
+      post.tags = post.tags.to_a.uniq
+    end
+  end
+end