How to download an mp3 of a Nico video

In this example, we will the following nico nico video:
http://www.nicovideo.jp/watch/sm8767243

1. Obtain the ID of a nico video.
   
   The ID is the sm part of the URL.
   
   In this case:
   

   sm8767243

2. Add the ID to the end of the URL: http://nicosound.anyap.info/sound/
   
   In this case:

   http://nicosound.anyap.info/sound/sm8767243

3. Once that page loads, search for a button with the text "パソコンへ転送".
   
   
4. Click to start the download.
   

If you still can't find the button, here's a visual guide


Note that the id may not always start with "sm". Other alphabets may precede the numbers or it may just be the numbers alone - whatever comes after
http://www.nicovideo.jp/watch/

Enjoy~!