(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)
(C61) [OVACAS (Hirokawa Kouichirou)] S.F.3.D (Various)
(C63) [OVACAS (Hirokawa Kouichirou)] Shirobom (Bomberman Jetters)
(C76) [OVACAS (Hirokawa Kouichirou)] Houkago XX Time (K-ON!)
(CT20) [OVACAS (Hirokawa Kouichirou)] Bouhatei no Onna. (Joshiraku)
(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
(C65) [OVACAS (Hirokawa Kouichirou)] FLOW MY TEARS A SENIOR SAID (Uchuu No Stellvia)
(C81) [OVACAS (Hirokawa Kouichirou)] SUITE&BITCH (Suite Precure)
(CSP5) [OVACAS (Hirokawa Kouichirou)] Haru Matsuri Chichi Matsuri 2010 (Various)