diff --git a/app/controllers/ajax/relationship_controller.rb b/app/controllers/ajax/relationship_controller.rb
deleted file mode 100644
index ba9f4546..00000000
--- a/app/controllers/ajax/relationship_controller.rb
+++ /dev/null
@@ -1,35 +0,0 @@
-# frozen_string_literal: true
-
-class Ajax::RelationshipController < AjaxController
-  before_action :authenticate_user!
-
-  def create
-    params.require :screen_name
-
-    UseCase::Relationship::Create.call(
-      source_user: current_user,
-      target_user: ::User.find_by!(screen_name: params[:screen_name]),
-      type:        params[:type]
-    )
-    @response[:success] = true
-    @response[:message] = t(".#{params[:type]}.success")
-  rescue Errors::Base => e
-    @response[:message] = t(e.locale_tag)
-  ensure
-    return_response
-  end
-
-  def destroy
-    UseCase::Relationship::Destroy.call(
-      source_user: current_user,
-      target_user: ::User.find_by!(screen_name: params[:screen_name]),
-      type:        params[:type]
-    )
-    @response[:success] = true
-    @response[:message] = t(".#{params[:type]}.success")
-  rescue Errors::Base => e
-    @response[:message] = t(e.locale_tag)
-  ensure
-    return_response
-  end
-end
diff --git a/spec/controllers/ajax/relationship_controller_spec.rb b/spec/controllers/ajax/relationship_controller_spec.rb
deleted file mode 100644
index 11d2ddbd..00000000
--- a/spec/controllers/ajax/relationship_controller_spec.rb
+++ /dev/null
@@ -1,153 +0,0 @@
-# coding: utf-8
-# frozen_string_literal: true
-
-require "rails_helper"
-
-describe Ajax::RelationshipController, type: :controller do
-  shared_examples_for "params is empty" do
-    let(:params) { {} }
-
-    include_examples "ajax does not succeed", "is required"
-  end
-
-  let!(:user) { FactoryBot.create(:user) }
-  let!(:user2) { FactoryBot.create(:user) }
-
-  describe "#create" do
-    shared_examples_for "valid relationship type" do
-      it_behaves_like "params is empty"
-
-      context "screen_name does not exist" do
-        let(:screen_name) { "peter-witzig" }
-
-        include_examples "ajax does not succeed", "not found"
-      end
-
-      context "screen_name is current user" do
-        let(:screen_name) { user.screen_name }
-
-        include_examples "ajax does not succeed", "yourself"
-      end
-
-      context "screen_name is different from current_user" do
-        let(:screen_name) { user2.screen_name }
-
-        it "creates the relationship" do
-          expect { subject }.to change { Relationship.count }.by(1)
-          expect(Relationship.last.target.screen_name).to eq(screen_name)
-        end
-      end
-    end
-
-    let(:type)        { "Sauerkraut" }
-    let(:screen_name) { user2.screen_name }
-    let(:params)      { { type: type, screen_name: screen_name } }
-
-    subject { post(:create, params: params) }
-
-    it_behaves_like "requires login"
-
-    context "user signed in" do
-      before(:each) { sign_in(user) }
-
-      context "type = 'follow'" do
-        let(:type) { "follow" }
-
-        include_examples "valid relationship type"
-
-        context "target user mutes source user" do
-          before do
-            user2.mute(user)
-          end
-
-          it "creates the relationship but no notification" do
-            expect { subject }.to change { Notification.count }.by(0)
-          end
-        end
-      end
-
-      context "type = 'block'" do
-        let(:type) { "block" }
-
-        include_examples "valid relationship type"
-      end
-
-      context "type = 'mute'" do
-        let(:type) { "mute" }
-
-        include_examples "valid relationship type"
-      end
-
-      context "type = 'dick'" do
-        let(:type) { "dick" }
-
-        it_behaves_like "params is empty"
-        include_examples "ajax does not succeed", "Invalid parameter"
-      end
-    end
-  end
-
-  describe "#destroy" do
-    shared_examples_for "valid relationship type" do
-      let(:screen_name) { user2.screen_name }
-
-      context "relationship exists" do
-        before do
-          user.public_send(type, user2)
-        end
-
-        it "destroys a relationship" do
-          expect { subject }.to change { Relationship.count }.by(-1)
-        end
-      end
-
-      context "relationship does not exist" do
-        it "does not change anything at all" do
-          expect { subject }.to change { Relationship.count }.by(0)
-        end
-      end
-
-      context "screen_name does not exist" do
-        let(:screen_name) { "peter-witzig" }
-
-        include_examples "ajax does not succeed", "not found"
-      end
-    end
-
-    let(:type)        { "Sauerkraut" }
-    let(:screen_name) { user2.screen_name }
-    let(:params)      { { type: type, screen_name: screen_name } }
-
-    subject { delete(:destroy, params: params) }
-
-    it_behaves_like "requires login"
-
-    context "user signed in" do
-      before(:each) { sign_in(user) }
-
-      context "type = 'follow'" do
-        let(:type) { "follow" }
-
-        include_examples "valid relationship type"
-      end
-
-      context "type = 'block'" do
-        let(:type) { "block" }
-
-        include_examples "valid relationship type"
-      end
-
-      context "type = 'mute'" do
-        let(:type) { "mute" }
-
-        include_examples "valid relationship type"
-      end
-
-      context "type = 'dick'" do
-        let(:type) { "dick" }
-
-        include_examples "ajax does not succeed", "Invalid parameter"
-      end
-    end
-  end
-end