Hey guys, I think I've stumbled upon something.
So, today, there was news on P4AU on p-ch.jp. Normal, of course, as it's an upcoming game. The link is here:
http://p-ch.jp/news/detail/?nid=176
Now, you might be thinking? "What's so peculiar here? It's just the commercial info." Click the image. It leads you to: p-atlus.balco.jp/p4u2/special/tvcm.html
What we can assume from this, is that this is the main server where all of the files, contents, and previews for the HTML pages are. So, it would definitely make sense that an employee forgot to take the "balco.jp" subdomain out, as they may have looked at the preview page before making it public, and copied the link from it. (To those who don't understand, think of this as like a queue for posts on tumblr, but a bit more complicated and different)
It appears to be password protected. But what I found next, blew me away. It seems this is the main Apache server for the Persona sites. Here, take a look:
http://p-atlus.balco.jp http://p-ch.balco.jp and lastly,
http://persona5.balco.jp Try any other subdomain with it, and it won't work. For example: aajskdhskf.balco.jp or persona4.balco.jp That turns up nothing. This definitely adds more weight to the theory, as it proves these are real subdomains of this server. (p-atlus.balco.jp, p-ch.balco.jp, and persona5.balco.jp)
Oh, and guess when
http://balco.jp was last modified? July 1, 2014, the day persona5.jp was last modified. Also, it's an Apache server. This, coupled with the password protection, and
http://balco.jp (the site without the subdomain) being forbidden, and the fact that barely any information on the registrant is available, makes me believe this is the main server for the Persona sites, as all use Apache as well. It makes sense, too. If we assume balco.jp is the main Apache server with all of the files, it'd make sense that whoever was in charge of making the site forgot to change where the image is linked to, as balco.jp would be the main server with all of the site contents, in this case, making it perfectly capable that an employee forgot to edit that link.
What do you think, everyone? Seems a bit too connected to just be a sheer coincidence, to me.
EDIT: Googling "balco.jp" does not bring up any results at all with "http://balco.jp" as the link, just other sites with similar titles to the phrase "balco". This adds even more weight to the theory. A server is something that wants to be kept private, after all.
EDIT 2: The registrant of the domain, Noriaki Ikumoto, works for a company called BALCOLONY. That may tie into all of this.
EDIT 3: Indeed, BALCOLONY. are the ones hosting the servers. We can pretty much call this confirmed. They designed P4G's Japanese site, hosted under
http://p-atlus.jp Remember, there is an
http://p-atlus.balco.jp and all subdomains such as /p4g/ work on it. I think it's pretty safe to confirm these are indeed the file hosts for these sites. Here is proof that BALCOLONY. works on web design for products, such as games, etc.:
http://www.balcolony.com/web/ and
http://www.balcolony.com/movie/
EDIT 4: The sites BALCOLONY. have helped create, all share similar directories. /common/ and /common/img/ Those two directories also appear on persona5.jp Apparently, BALCOLONY. also designs logos and teaser sites, too. I think it's safe to say that balco.jp is really the file server.