Otonano Omochiya Vol. 16
[OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] Deep impact (Cosmic Baton Girl Comet-san)
Love Style
(C84) [OVACAS (Hirokawa Kouichirou)] Kedamono-tachi no YAMATO. (Space Battleship Yamato 2199)
Haru Matsuri Chichi Matsuri 2010
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
COMIC Penguin Club Sanzokuban 2001-06
(C79) [OVACAS (Hirokawa Kouichirou)] Tenshi(Bitch) ni Love Song o! (Panty & Stocking with Garterbelt)
(C73) [OVACAS (Hirokawa Kouichirou)] Banchou Densetsu (Minami-ke)
(C63) [OVACAS (Hirokawa Kouichirou)] Shirobom (Bomberman Jetters)
(Suika Musume 3) [Ovacas (Hirokawa Kouichirou)] Asama de Training (Issho ni Training)
[INFINITY-FORCE (Various)] Digitama 04 FRONTIER (Digimon Tamers, Digimon Frontier)
Otonano Omochiya 6 Kan
Pachie-bon
[Hirokawa Tomo] Cherry Concerto
(COMIC1) [OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] Itazura Drill (Tengen Toppa Gurren Lagann)
Otonano Omochiya Vol. 1-14
[Hirokaworld (Hirokawa)] Shiikibi (Various) [Digital]
COMIC Penguinclub Sanzokuban 2003-11
(CR35) [Abellcain (Fujimaru Arikui)] KALEIDOSCOPE (Kaleidostar)
Otonano Omochiya 12 Futaba no Ohanashi Matome 2
[Hirokawa Tomo] Fresh Meat!
[COMIC] Penguinclub Sanzokuban 2003-02
Ovacas Style 2008
(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 EVENT EDITION (Various)
Comic Sigma Volume 1
(C77) [OVACAS (Hirokawa Kouichirou)] Love Style (Love Plus)
[Anthology] Love Chara Taizen No. 6
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
COMIC Penguinclub Sanzokuban 2003-12
(C64) [Infinity-Force (Mercy Rabbit, Rokujou Mugi, Buruma Hogero, Hirokawa Kouichirou, Yamashita Woory)] MRR A GO!! (Machine Robo Rescue)
(C76) [OVACAS (Hirokawa Kouichirou)] Houkago XX Time (K-ON!)
Otonano Omochiya 17
Otonano Omochiya 12 Futaba no Ohanashi Matome 12
[ANTHOLOGY] Meganekko Deluxe
(C67) [OVACAS (Hirokawa Kouichirou)] HIME-Hajime (My-HiME)
(C56) [Doudan Tsutsuji (Doudantsutsuji, Hirokawa Tomo)] Getten! (Mamotte Shugogetten)
[Dangan Densetsu (Hirokawa Tomo)] Fairy Shape (Final Fantasy VIII)
Otonano Omochiya Vol. 14
[Yumeizukosya, OVACAS (Hirokawa Kouichirou)] Ebisu Taisen (Sakura Taisen)
(CT20) [OVACAS (Hirokawa Kouichirou)] Bouhatei no Onna. (Joshiraku)
COMIC Penguinclub Sanzokuban 2002-10
After School XX Time
(C61) [OVACAS (Hirokawa Kouichirou)] S.F.3.D (Various)
[Hirokawa Tomo] Fresh Meat! [Chinese]
Magical? Banana
(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
(C69) [KNOCKOUT (Various)] Oshiri de Kyu! 9 (Various)
(C69) [OVACAS (Hirokawa Kouichirou)] 1-NEN C-GUMI MAHOGUMI (Pani Poni)
Otonano Omochiya Vol.13
(C75) [Ovacas (Hirokawa Kouichirou)] Ovacas Style 2008 (Kannagi, Queen's Blade, Strike Witches)
(C62) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 4 Sokuon (Azumanga-Daioh)
(C62) [KNOCKOUT (Various)] Oshiri de Kyu! 7 (Various)
COMIC Penguin Club Sanzokuban 2001-04
(C65) [INFINITY-FORCE (Various)] BL Are Go!! (Machine Robo Rescue)