(CSP4) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri (School Rumble, Mai-HiME) Hentai (CSP4) [OVACAS (広川浩一郎)] 春まつり 乳まつり (スクールランブル、舞-HiME)

(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 (Various)

[OVACAS (Hirokawa Kouichirou)] Kashi 1114 (Ojamajo Doremi)

(C80) [OVACAS (Hirokawa Kouichirou)] A STYLE. (A Channel)

(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 EVENT EDITION (Various)

(C60) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 3 (Various)

(C73) [OVACAS (Hirokawa Kouichirou)] Banchou Densetsu (Minami-ke)

(C68) [OVACAS (Hirokawa Kouichirou)] MAI-CCHING (Mai-HiME) [English] [SaHa]

(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)

(C67) [OVACAS (Hirokawa Kouichirou)] HIME-hajimeru (My-HiME) [English] [SaHa]

(C67) [OVACAS (Hirokawa Kouichirou)] HIME-Hajime (My-HiME)