The website you're talking about should be this one:
http://8yml8yml.wixsite.com/88888888/illustThe #R18s section is the one needing a password to gain access to.
According to
http://8yml8yml.wixsite.com/88888888/pass , you have to subscribe via PixivFANBOX or Enty, download a game called "Best Way to Purchase a Hunk" (????????????), and you'll see the password at the last page (He says it's a game, not a doujin, though?), which is colored pink.
Don't expect the images featured there to be uncensored, though. #R18s only means that the pics are all NSFW, and what
>>2596904 said is no joke.
