(C82) [OVACAS (Hirokawa Kouichirou)] Osaki mo Mae mo Marii-san. (Joshiraku)
Otonano Omochiya 12 Futaba no Ohanashi Matome 2
(C81) [Manchin Sakura (COSiNE ,Erect Sawaru and more) Chun-li san to COSiNE ni Shuu Shuunen Kinen Hon (Street Fighter)
(C66) [Shuudan Bouryoku (Various)] File/12 Record of Aldelayd - EXHIBITION DX4
Otonano Omochiya Vol. 14
(C90) [Hooliganism (Murasaki Syu, Hirokawa Kouichirou)] Kono Subarashii Demi-chan no Demi Sauce! (Demi-chan wa Kataritai, Kono Subarashii Sekai ni Syukufuku o!)
(C99) [Otonano Omochiya (Hirokawa)] Otonano Omochiya 17 [Chinese]
(C65) [OVACAS (Hirokawa Kouichirou)] FLOW MY TEARS A SENIOR SAID (Uchuu No Stellvia)
(CR27) [Dangan Densetsu Laser (Hirokawa Tomo, Nerima Yoshito)] Kairaku Gensoku Hagurumashiki Soutei Souchi (Revolutionary Girl Utena)
Hungar x Hungar One Pause (Hunter x Hunter One Piece)
Otonano Omochiya Vol. 1-14
[Otonano Omochiya (Hirokawa)] Otonano Omochiya 3 Kan
(C60) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 3 (Various)
Otonano Omochiya 6 Kan
[Hirokawa Kouichirou] A to Z
COMIC Penguin Club Sanzokuban 2001-08 [Incomplete]
[Shuudan Bouryoku (Murasaki Syu)] Takanashi-san-chi no 4 Shimai - 1 (WORKING!!)
(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni Dash!)
[Hirokaworld (Hirokawa)] petta
(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)
[Anthology] Love Chara Taizen No. 7 (Various)
Otonano Omochiya Vol. 16
Otonano Omochiya 12 Futaba no Ohanashi Matome 12
(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!) [English] [biribiri]
(C55) [OVACAS (Various)] Heppoko Anime Chinpure Koupure (Various)
(C69) [KNOCKOUT (Various)] Oshiri de Kyu! 9 (Various)
(Puniket 19) [Hirokaworld (Hirokawa)] Shiikibi (Various)
(C67) [OVACAS (Hirokawa Kouichirou)] HIME-Hajime (My-HiME)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
COMIC Penguinclub Sanzokuban 2003-01
[Otonano Omochiya (Hirokawa)] Otonano Omochiya Vol. 16 [Chinese]
(C64) [Abellcain (Fujimaru Arikui)] Lucky Come Come (Kujibiki Unbalance)
(C67) [OVACAS (Hirokawa Kouichirou)] HIME-hajimeru (My-HiME) [English] [SaHa]
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
(SC27) [Hirokaworld (Hirokawa)] 15/21 (3-nen B-gumi Kinpachi Sensei Densetsu no Kyoudan ni tate!)