diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index 82d3639..1f8fdf0 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -11,7 +11,6 @@
 //= require underscore-min
 //= require backbone-min
 //= require jquery.timeago
-//= require backbone/asciinema
 
 $(function() {
   $('abbr.timeago').timeago();
diff --git a/app/assets/javascripts/backbone/asciinema.js.coffee b/app/assets/javascripts/backbone/asciinema.js.coffee
deleted file mode 100644
index 093960c..0000000
--- a/app/assets/javascripts/backbone/asciinema.js.coffee
+++ /dev/null
@@ -1,11 +0,0 @@
-#= require_self
-#= require_tree ./templates
-#= require_tree ./models
-#= require_tree ./views
-#= require_tree ./routers
-
-window.Asciinema =
-  Models: {}
-  Collections: {}
-  Routers: {}
-  Views: {}
diff --git a/app/assets/javascripts/backbone/models/.gitkeep b/app/assets/javascripts/backbone/models/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/app/assets/javascripts/backbone/models/comment.js.coffee b/app/assets/javascripts/backbone/models/comment.js.coffee
deleted file mode 100644
index 9492680..0000000
--- a/app/assets/javascripts/backbone/models/comment.js.coffee
+++ /dev/null
@@ -1,7 +0,0 @@
-class Asciinema.Models.Comment extends Backbone.Model
-
-  user: ->
-    this.get('user')
-
-class Asciinema.Collections.Comments extends Backbone.Collection
-  model: Asciinema.Models.Comment
diff --git a/app/assets/javascripts/backbone/routers/.gitkeep b/app/assets/javascripts/backbone/routers/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/app/assets/javascripts/backbone/templates/.gitkeep b/app/assets/javascripts/backbone/templates/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/app/assets/javascripts/backbone/views/.gitkeep b/app/assets/javascripts/backbone/views/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/app/assets/javascripts/backbone/views/base.js.coffee b/app/assets/javascripts/backbone/views/base.js.coffee
deleted file mode 100644
index 45d94bd..0000000
--- a/app/assets/javascripts/backbone/views/base.js.coffee
+++ /dev/null
@@ -1,4 +0,0 @@
-class Asciinema.Views.Base extends Backbone.View
-
-  current_user: ->
-    Asciinema.current_user
diff --git a/app/assets/javascripts/backbone/views/comments/comments_index.js.coffee b/app/assets/javascripts/backbone/views/comments/comments_index.js.coffee
deleted file mode 100644
index 28257b2..0000000
--- a/app/assets/javascripts/backbone/views/comments/comments_index.js.coffee
+++ /dev/null
@@ -1,33 +0,0 @@
-class Asciinema.Views.CommentsIndex extends Asciinema.Views.Base
-
-  el: '#comments'
-
-  initialize: ->
-    @collection.on('reset', @addAll, this)
-    @collection.on('add', @addOne, this)
-
-    $('#new-comment').submit (event) =>
-      @createComment(event)
-
-  addAll: ->
-    @collection.each (comment) =>
-      @addOne(comment)
-
-  addOne:(comment) ->
-    view = new Asciinema.Views.CommentEntry({ model: comment, collection: @collection})
-    $(this.el).append view.render().el
-
-  createComment: (event) ->
-    event.preventDefault()
-
-    attrs = body: $('#comment-body').val()
-    @collection.create attrs,
-      wait: true
-      success: -> $('#new-comment')[0].reset()
-      error: @handleError
-
-  handleError: (comment, response) ->
-    if response.status == 422
-      errors  = $.parseJSON(response.responseText).errors
-      for attribute, messages of errors
-        alert "#{attribute} #{message}" for message in messages
diff --git a/app/views/layouts/_current_user_js.html.erb b/app/views/layouts/_current_user_js.html.erb
deleted file mode 100644
index 1cd5903..0000000
--- a/app/views/layouts/_current_user_js.html.erb
+++ /dev/null
@@ -1,5 +0,0 @@
-<script type="text/javascript">
-  jQuery(document).ready(function(){
-    Asciinema.current_user = <%= raw current_user.to_json(:only => [:id, :nickname, :avatar_url]) %>;
-  });
-</script>
diff --git a/app/views/layouts/application.html.slim b/app/views/layouts/application.html.slim
index 93ecc66..4bb125c 100644
--- a/app/views/layouts/application.html.slim
+++ b/app/views/layouts/application.html.slim
@@ -8,7 +8,6 @@ html[lang="en"]
     = javascript_include_tag "application"
     = javascript_include_tag "player"
     = favicon_link_tag 'favicon.png'
-    = render :partial => 'layouts/current_user_js'
     = render :partial => 'layouts/ga'
     script
       | window.mainWorkerPath = '#{javascript_path "main_worker"}';