Otonano Omochiya Vol. 15
[Hirokawa Kouichirou] Deep Trip | 銷魂之旅 [Chinese]
(C76) [OVACAS (Hirokawa Kouichirou)] Houkago XX Time (K-ON!)
(C60) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 3 (Various)
(C70) [OVACAS (Hirokawa Kouichirou)] Magical? Banana (Renkin 3-kyuu Magical? Pokaan)
COMIC Penguinclub Sanzokuban 2003-12
COMIC Penguinclub Sanzokuban 2002-12
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
Capricon I - Director's Cut
[ANTHOLOGY] Meganekko Deluxe
[Anthology] Love Chara Taizen No. 6
COMIC Penguinclub Sanzokuban 2003-11
(CSP4) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri (School Rumble, Mai-HiME)
(Puniket 9) [Marchen Box (Various)] Two Toned Romps (Pretty Cure)
(SC23) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Precure Machine (Futari wa Precure)
(C78) [Shuudan Bouryoku (Various)] Hooliganism 17 Record of ALDELAYD Act.12 Exhibition DX9
(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME) [English] [SaHa]
(SC23) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Precure Machine (Pretty Cure)
Otonano Omochiya Vol. 1-14
(SC19) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Rotation (Gundam SEED)
Otonano Omochiya Vol. 15
(C71) [OVACAS (Hirokawa Kouichirou)] BITCH STYLE (WITCHBLADE) [English] [desudesu]
(C62) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 4 Sokuon (Azumanga-Daioh)
(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni Dash!)
(C73) [OVACAS (Hirokawa Kouichirou)] Banchou Densetsu (Minami-ke)
Magical? Banana
[Otonano Omochiya (Hirokawa)] Otonano Omochiya 12 Futaba no Ohanashi Matome 2 [English] [Digital] [Ongoing]
Ovacas Style 2008
COMIC Penguin Club Sanzokuban 2001-04
[Otonano Omochiya (Hirokawa)] Otonano Omochiya Vol. 16 [Chinese]
[Anthology] Dennou Butou Musume Vol 5
[Otonano Omochiya (Hirokawa)] Otonano Omochiya Vol. 16 [English]
(Puniket 21) [Hirokaworld (Hirokawa)] Kojikabon Plus (Kodomo no Jikan)
COMIC Penguin Club Sanzokuban 2001-06
COMIC Penguinclub Sanzokuban 2002-10
Otonano Omochiya Vol.6 - Ch.4
(C76) [OVACAS (Hirokawa Kouichirou)] Asamade Training (Issho ni Training)
[Hirokaworld (Hirokawa)] Neko Ebon Plus
[Hirokawa Tomo] Cherry Concerto
(C70) [Knockout, Nikomark (Various)] Chougokubuto | Super Gokubuto (Various)
[OVACAS (Hirokawa Kouichirou)] Kashi 1114 (Ojamajo Doremi)
Otonano Omochiya Vol. 16
Otonano Omochiya Vol. 13
(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 EVENT EDITION (Various)
After School XX Time
[Yumeizukosya, OVACAS (Hirokawa Kouichirou)] Ebisu Taisen (Sakura Taisen)
[Hirokawa Kouichirou] PET LIFE
Otonano Omochiya 17
(C62) [Knockout (Various)] Oshiri de Kyu! 7 (Various)
(SC32) [OVACAS (Hirokawa Kouichirou)] another day (Ojamajo Doremi)
[Kantou Usagi Gumi] Pink Kami Keikaku (Various)