(CSP4) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri (School Rumble, Mai-HiME)
(Puniket 12) [OVACAS (Hirokawa Kouichirou)] Sensei dazo! (Pani Poni)
(ABC 5) [OVACAS (Hirokawa Kouichirou)] Iro Iro Gal and Dou (Various)
(CR36) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Iron Maiden (Genshiken, Kujibiki Unbalance)
(C71) [OVACAS (Hirokawa Kouichirou)] BITCH STYLE (WITCHBLADE) [English] [desudesu]
(C76) [OVACAS (Hirokawa Kouichirou)] Houkago XX Time (K-ON!)
(C76) [OVACAS (Hirokawa Kouichirou)] Asamade Training (Issho ni Training)
(SC19) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Rotation (Gundam SEED)
Takamori Aiko hamedori manga
(Mimiket 3) [OVACAS (Hirokawa Kouichirou)] Zoids Tanekentai Born Free (ZOIDS)
(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME) [English] [SaHa]
(COMIC1☆2) [OVACAS (Hirokawa Kouichirou)] Kurobeta (Minami-ke)
(Tougetsu-sai) [OVACAS (Hirokawa Kouichirou)] IYASI-K (Pani Poni)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
[OVACAS] OVACAS SKETCH 2
Ovacas Style 2008
(C84) [OVACAS (Hirokawa Kouichirou)] Kedamono-tachi no YAMATO. (Space Battleship Yamato 2199)
(C77) [OVACAS (Hirokawa Kouichirou)] Love Style (Love Plus)
[Tonnosuke] Izumi Sensei no Milky Lesson (COMIC Shingeki 2012-05)
(C67) [OVACAS (Hirokawa Kouichirou)] HIME-hajimeru (My-HiME) [English] [SaHa]
[OVACAS] Love Style+
(CT20) [OVACAS (Hirokawa Kouichirou)] Bouhatei no Onna. (Joshiraku)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star) [English] [desudesu]
(SC23) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Precure Machine (Futari wa Precure)
(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME)
(SC23) [Abellcain, OVACAS (Fujimaru Arikui, Hirokawa Kouichirou)] Precure Machine (Pretty Cure)
(C55) [OVACAS (Various)] Heppoko Anime Chinpure Koupure (Various)
[Amadeus No Isan] Rapid Game {To Heart 2}
[Yumeizukosya, OVACAS (Hirokawa Kouichirou)] Ebisu Taisen (Sakura Taisen)
[Yuzupon] HONEY
(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 EVENT EDITION (Various)
[Riko] Umi ni Ikou yo | Let's Go to the Beach! (Otokonoko Heaven's Door 1) [English] [captcarisma]
Love Style
(C54) [OVACAS (Various)] Capricon 1 Director's Cut (Various)
[OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] Deep impact (Cosmic Baton Girl Comet-san)
[Miray Ozaki] Boy Meets Girl 2
(C80) [OVACAS (Hirokawa Kouichirou)] A STYLE. (A Channel)
(C66) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 5 (Pretty Cure)
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)
(C60) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 3 (Various)
[Maihama Kaede] Oppai Mamire
(C70) [OVACAS (Hirokawa Kouichirou)] Magical? Banana (Renkin 3-kyuu Magical? Pokaan)
(SC32) [OVACAS (Hirokawa Kouichirou)] another day (Ojamajo Doremi)
(SC16) [Ovacas (Hirokawa Kouichirou)] Nichiyou Asa no 8-ji 30-bu (Ojamajo Doremi)
(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!)
(C71) [OVACAS (Hirokawa Kouichirou)] BITCH STYLE (WITCHBLADE)
(C69) [OVACAS (Hirokawa Kouichirou)] 1-NEN C-GUMI MAHOGUMI (Pani Poni)
Comic BonBobon! 2000-08
(C74) [OVACAS, Abellcain (Hirokawa Kouichirou, Fujimaru Arikui)] S.M.S Niyoukoso! (Macross Frontier)
(C75) [Ovacas (Hirokawa Kouichirou)] Ovacas Style 2008 (Kannagi, Queen's Blade, Strike Witches)