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[jen_kat]

There's Gamerz Heaven doujinshi by Murakami Maki...

Gamerz Heaven Director's Cut # 1 (Rush version 1)
http://jpqueen.com/onlineshop/productinfo.asp?PID=39502

Gamerz Heaven Director's Cut # 2 (Kaito version)
http://jpqueen.com/onlineshop/productinfo.asp?PID=42682

Gamerz Heaven Director's Cut RED
http://jpqueen.com/onlineshop/productinfo.asp?PID=58637

Oh look! A Chrono Cross doujinshi that's not yaoi :O

Hoshiiro no Shizuku
http://jpqueen.com/onlineshop/productinfo.asp?PID=65660

I think I still have this Final Fantasy 8 one:

Like a fantasy # 1
http://jpqueen.com/onlineshop/productinfo.asp?PID=57421

But I never bought the second one... it's Ellone x Laguna D:

Like a fantasy # 2 (final vol)
http://jpqueen.com/onlineshop/productinfo.asp?PID=57420

These two Howl's Moving Castle doujin are interesting because they deal more with the book-relationships (i.e. Solomon & Letty, Michael & Martha):

Kyuutei Majutsushi no Deshi
http://jpqueen.com/onlineshop/productinfo.asp?PID=60457

Sense of Value
http://jpqueen.com/onlineshop/productinfo.asp?PID=62507