You can buy if from dlsite for 735 yen (about $9/£6), doesn't look like you can get it on the english version of the site anymore.
hxxp://www.dlsite.com/maniax/work/=/product_id/RJ082148
To get the ENF content you first have to collect 50 hearts and then get defeated; the girl's clothes get shredded and then you have to run around looking for something to wear. Trouble is, the counter that shows how many hearts you have doesn't show up until after you loose all your health so it takes a little guesswork.
There is a link to download the game for free over on the hongfire forums, but I can't post that here since it would be against the terms of service :p
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