The following happens out of pure curiosity. I don't have that many doujinshi, I know... *looks at the stack on the bed* ... anyhow, let's start:

[fandom]
doujinshi


[Black Cat]
BlackxBlack


[Death Note]
3-nen L-gumi ~ Hentai Sensei!
Allora
Anata to Watashi no Kyoukaisen
Black Note: L Uke Special
Clap Your Hands
Dead or Alive
Death Cinema Paradise
Eruru 100%
Eruru Special
Human Washer
Ironna mokomoko Feather - Light
Kisama Zenshinzenrei de Boku wo chouhatsushiteru daro
Light-Note
Mononoke Hakaranda (Jou)
Mononoke Hakaranda (Ge)
Noumiso Pink
Purr Purr Purr
R18
Rush! ~ Chikan Densha ~
Socks Mania
Takuran
unfair


[Gundam Seed]
Boku no Chikyuu wo mamotte


[Harry Potter]
Happy Valley


[Kuroshitsuji]
Chelsea Drop
Kantarella


[Mix]
Naruto desu no (Death Note & Naruto)


[Naruto]
Attenochi
Desire
Ero Ero Volume 2.0
Footsteps 2
Goshujin-sama no Oose no mama ni
Guruguru Revolution - Sasu x Naru Special 7
Guruguru Revolution - Sasu x Naru Special 8
Hitokage 2
Kairou
Kogitsune wo meshiagare?
Orange Days
Ouja no Shirushi
Piyopiyo Box
Sakatoki no Hako
Shinobi Volume 2
Tales of Wind
Teki ka Mikata ka
Thanatos
Tsukikage nite
Waracchau kurai Shiawase na Futari


[Shaman King]
Hanshin 4
Natsu Urara


[Togainu no Chi]
Darkness at Noon
Kohaku to Ao no Shizuku
Light x Shadow


[Vampire Knight]
Hunter Hunted


[Weiß Kreuz]
As know as
drei
Hello, Goodbye
Little Age
No Earthling
Overture


[Yu-Gi-Oh!]
Castle Imitation
Crimson Red
Gekkan Duelist Special 05
Hot Summer Night
KaiYami-Decade/1997 - 2006
Saikyou Kettousha Ikusei Keikaku
Sailor fuku to Duel King
Shiro Hebi-san to kuro Neko-kun
Shiro Hebi-san to kuro Neko-kun #2 - Seasons of Change
Shiro Hebi-san to kuro Neko-kun #3
Shiro Hebi-san to kuro Neko-kun #4 - Amai Unmei
The Duelsick Star!!
Telephone Line
Yuuseihaguruma Kikou


Any~how~ Let's count:

Black Cat: 1
Death Note: 22
Gundam Seed: 1
Harry Potter: 1
Kuroshitsuji: 2
Mix: 1
Naruto: 20
Shaman King: 2
Togainu no Chi: 3
Vampire Knight: 1
Weiß Kreuz: 6
Yu-Gi-Oh!: 14

Total: 74