Otonano Omochiya 6 Kan
[Hirokawa Kouichirou] Deep Trip
[OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia Kaiteiban (Manabi Straight!)
(C65) [OVACAS (Hirokawa Kouichirou)] FLOW MY TEARS A SENIOR SAID (Uchuu No Stellvia)
Otonano Omochiya 17
(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!) [English] [biribiri]
[Otonano Omochiya (Hirokawa)] Otonano Omochiya Vol. 14 [English] [ChoriScans]
(C81) [OVACAS (Hirokawa Kouichirou)] SUITE&BITCH (Suite Precure)
(C74) [OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] S.M.S Niyoukoso! (Macross Frontier)
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
COMIC Penguin Club Sanzokuban 2001-06
(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!)
(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)
(C64) [Abellcain (Fujimaru Arikui)] Lucky Come Come (Kujibiki Unbalance)
Otonano Omochiya Vol.6 - Ch.4-5
COMIC Penguinclub Sanzokuban 2002-10
(C74) [Hirokaworld (Hirokawa)] Akiratama (Lucky☆Star)
(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni Dash!)
Otonano Omochiya Vol. 14
(C66) [INFINITY-FORCE (Mercy Rabbit)] VS∞ VURSUS INFINITY (Capcom vs. SNK)
(C60) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 3 (Various)
(SC32) [OVACAS (Hirokawa Kouichirou)] another day (Ojamajo Doremi)
[Hirokawa Kouichirou] Deep Trip | 銷魂之旅 [Chinese]
(C73) [OVACAS (Hirokawa Kouichirou)] Banchou Densetsu (Minami-ke)
Otonano Omochiya Vol.13
[Hirokaworld (Hirokawa)] Shiikibi (Various) [Digital]
(ABC 5) [OVACAS (Hirokawa Kouichirou)] Iro Iro Gal and Dou (Various)
Otonano Omochiya Vol. 1-14
(C54) [OVACAS (Various)] Capricon 1 Director's Cut (Various)
(C56) [OVACAS (Various)] Dore Mix (Ojamajo Doremi)
Otonano Omochiya 6 Kan Ch. 1
(C67) [OVACAS (Hirokawa Kouichirou)] HIME-Hajime (My-HiME)
(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME)
[OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] Deep impact (Cosmic Baton Girl Comet-san)
(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni)
[ANTHOLOGY] Meganekko Deluxe
Otonano Omochiya Vol. 15
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
[Hirokawa Tomo] Fresh Meat! [Chinese]
(C51) [Hiasobi Club (Fumizuki Kou)] NO BRAND LONELY WINTER
(C82) [OVACAS (Hirokawa Kouichirou)] Osaki mo Mae mo Marii-san. (Joshiraku)
[Dangan Densetsu (Hirokawa Tomo)] Fairy Shape (Final Fantasy VIII)
[Otonano Omochiya (Hirokawa)] Otonano Omochiya 12 Futaba no Ohanashi Matome 2 [English] [Digital] [Ongoing]
(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME) [English] [SaHa]
[Otonano Omochiya (Hirokawa)] Otonano Omochiya Vol. 15 [English]
(C63) [OVACAS (Hirokawa Kouichirou)] Shirobom (Bomberman Jetters)
[Anthology] Love Chara Taizen No. 7 (Various)
Pachie-bon
(COMIC1☆2) [OVACAS (Hirokawa Kouichirou)] Kurobeta (Minami-ke)
(SC16) [Ovacas (Hirokawa Kouichirou)] Nichiyou Asa no 8-ji 30-bu (Ojamajo Doremi)
(C52) [Raimusha (Various)] Ebisu Taisen Kanzenban (Sakura Taisen)
(C79) [OVACAS (Hirokawa Kouichirou)] Tenshi(Bitch) ni Love Song o! (Panty & Stocking with Garterbelt)
(C70) [OVACAS (Hirokawa Kouichirou)] Magical? Banana (Renkin 3-kyuu Magical? Pokaan)
COMIC Penguin Club Sanzokuban 2000-09
COMIC Penguinclub Sanzokuban 2003-08
(Puniket 19) [Hirokaworld (Hirokawa)] Shiikibi (Various)
(Suika Musume 3) [Ovacas (Hirokawa Kouichirou)] Asama de Training (Issho ni Training)