(CT20) [OVACAS (Hirokawa Kouichirou)] Bouhatei no Onna. (Joshiraku) Pics (こみトレ20) [OVACAS (広川浩一郎)] 防波堤の女。 (じょしらく)

(C62) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 4 Sokuon (Azumanga-Daioh)

(C72) [Ovacas (Hirokawa Kouichirou)] Lucky Punch (Lucky Star)

(C83) [OVACAS (Hirokawa Kouichirou)] Buratei Heart. (Joshiraku)

(C78) [OVACAS (Hirokawa Kouichirou)] Love Style Plus (Love Plus) [English] [shakuganexa]

(C75) [Ovacas (Hirokawa Kouichirou)] Ovacas Style 2008 (Kannagi, Queen's Blade, Strike Witches)

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

(C82) [OVACAS (Hirokawa Kouichirou)] Osaki mo Mae mo Marii-san. (Joshiraku)

(C66) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 5 (Pretty Cure)

(COMIC1☆2) [OVACAS (Hirokawa Kouichirou)] Kurobeta (Minami-ke)

(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)