I have a question.

[AuraTwilight]

Of course. How could it not?

[laysh]

.hack is usaly connected to everything in some way.

[Red]

All .hack products are on a timeline.

//AI-Buster is a short time before
//Sign is just before
//Infection, Mutation, and so on are 4 years before
//Twilight Bracelet is an unspecified ammount of time before
//GU.

Tadah!

[laysh]

Time Line:
Dec. 24 2005 - Pluto's Kiss

Summer of 2006:Fragment is being created

May 2007 - Tokuoka and watarai works on the japanese version of fragment later becoming "The World"
July 2007 - fragment becomes the most popular topic
October 2007 - CC Corp. announces the release of fragment
November 2007 - "The World" recieves 100,000 orders.
end of November 2007 - CC denies about discontinuing "The World"
Dec. 24 2007 - "The World" download begines

2010 - .Hack//Ai Buster Vol.1 -> .Hack//Sign -> the Second net crash known as the second Pluto (.hack//Twilight Incedent)

2011 - Watarai leaves CC Corp.

2013 - Saki Shibayama takes over as official debugger, Rena Purchases "The World"

2014 - .hackers offical Limited Edition Character Exhibition. (.Hack//Legend of Twilight)

2017 - .Hack//G.U.

[Red]

Obligatory:
Tadah!

[Erroneous]

Short answer: yes indirectly the series connect as in the timeline and the world but a large gap in time frame and the current cast.

[Snake]

Wow I didn't think ALL .Hack products are all in together. I thought it is just the animes and games.

[Blackwolf203]

Wow I didn't think ALL .Hack products are all in together. I thought it is just the animes and games.

well guess what you were wrong plane and simple you were wrong so live with it (JKin people just JKin)

[laysh]

Was that really needed?

Thanks to .hack//Ai Buster 2 i found out .hack//Sign was in 2010 not 2007 like I thought.