(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni Dash!)
Haru Matsuri Chichi Matsuri 2010
(SC16) [Ovacas (Hirokawa Kouichirou)] Nichiyou Asa no 8-ji 30-bu (Ojamajo Doremi)
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
大人のおもちや3巻
Otonano Omochiya Vol.6 - Ch.4
[Hirokawa Kouichirou] Deep Trip
(C78) [Shuudan Bouryoku (Murasaki Syu)] Hooliganism 17 Record of ALDELAYD Act.12 Exhibition DX9 (English) =LWB=
[Kantou Usagi Gumi] Pink Kami Keikaku (Various)
(Comic Castle Final) [Nipopo Crisis, OVACAS (Genka Ichien, Hirokawa Kouichirou) Patsukin Dynamite HEAVEN (Bakusou Kyoudai Lets & Go!!)
COMIC Penguinclub Sanzokuban 2003-12
(C61) [OVACAS (Hirokawa Kouichirou)] S.F.3.D (Various)
(C65) [OVACAS (Hirokawa Kouichirou)] FLOW MY TEARS A SENIOR SAID (Uchuu No Stellvia)
(C66) [Shuudan Bouryoku (Various)] File/12 Record of Aldelayd - EXHIBITION DX4
(Puniket 9) [Marchen Box (Various)] Two Toned Romps (Pretty Cure)
Otonano Omochiya 6 Kan
[Anthology] Love Chara Taizen No. 7 (Various)
(C84) [OVACAS (Hirokawa Kouichirou)] Kedamono-tachi no YAMATO. (Space Battleship Yamato 2199)
Men's Dolphin 1999-11-01 Vol.03
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
(Puniket 11) [Hirokaworld (Hirokawa)] Pachie-bon (3-nen B-gumi Kinpachi Sensei Densetsu no Kyoudan ni tate!)
(C64) [Abellcain (Fujimaru Arikui)] Lucky Come Come (Kujibiki Unbalance)
(C73) [OVACAS (Hirokawa Kouichirou)] Banchou Densetsu (Minami-ke)
COMIC Penguin Club Sanzokuban 2001-06
(C63) [OVACAS (Hirokawa Kouichirou)] Shirobom (Bomberman Jetters)
[Hirokaworld (Hirokawa)] Shiikibi (Various) [Digital]
[Hirokawa Tomo] Cherry Concerto
Otonano Omochiya Vol. 13
(C81) [OVACAS (Hirokawa Kouichirou)] SUITE&BITCH (Suite Precure)
[Hirokawa Kouichirou] Deep Trip | 銷魂之旅 [Chinese]
(C51) [Hiasobi Club (Fumizuki Kou)] NO BRAND LONELY WINTER
(Puniket 19) [Hirokaworld (Hirokawa)] Shiikibi (Various)
Otonano Omochiya 6 Kan Ch. 1
(C75) [Ovacas (Hirokawa Kouichirou)] Ovacas Style 2008 (Kannagi, Queen's Blade, Strike Witches)
(C70) [OVACAS (Hirokawa Kouichirou)] Magical? Banana (Renkin 3-kyuu Magical? Pokaan)
COMIC Penguin Club Sanzokuban 2001-08 [Incomplete]
[Otonano Omochiya (Hirokawa)] Otonano Omochiya 12 Futaba no Ohanashi Matome 2 [English] [Digital] [Ongoing]
Hungar x Hungar One Pause (Hunter x Hunter One Piece)
KupaaBon 3
(C66) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 5 (Pretty Cure)
(C62) [Knockout (Various)] Oshiri de Kyu! 7 (Various)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
(Puniket 9) [Hirokaworld (Hirokawa)] Nyaa Hon
[INFINITY-FORCE (Various)] Digitama 04 FRONTIER (Digimon Tamers, Digimon Frontier)
Capricon I - Director's Cut
(C70) [Knockout, Nikomark (Various)] Chougokubuto | Super Gokubuto (Various)
Otonano Omochiya Vol.6 - Ch.4-5
(C74) [OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] S.M.S Niyoukoso! (Macross Frontier)
[Dangan Densetsu (Hirokawa Tomo)] Fairy Shape (Final Fantasy VIII)
Otonano Omochiya 12 Futaba no Ohanashi Matome 2
[Hirokaworld (Hirokawa)] petta
Two Toned Romps
(SC27) [Hirokaworld (Hirokawa)] 15/21 (3-nen B-gumi Kinpachi Sensei Densetsu no Kyoudan ni tate!)
Otonano Omochiya 12 Futaba no Ohanashi Matome 12
(C62) [KNOCKOUT (Various)] Oshiri de Kyu! 7 (Various)
Tenshi ni Love Song o!
[OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] Deep impact (Cosmic Baton Girl Comet-san)
(C83) [OVACAS (Hirokawa Kouichirou)] Buratei Heart. (Joshiraku)
(C54) [OVACAS (Various)] Capricon 1 Director's Cut (Various)
Comic Sigma Volume 1
COMIC Penguinclub Sanzokuban 2003-01
(C65) [Infinity-Force (Various)] BL Are Go!! (Machine Robo Rescue)
[OVACAS (Hirokawa Kouichirou)] Kashi 1114 (Ojamajo Doremi)
(C78) [OVACAS (Hirokawa Kouichirou)] Love Style Plus (Love Plus)
Otonano Omochiya Vol. 16
COMIC Penguinclub Sanzokuban 2003-11