[OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia Kaiteiban (Manabi Straight!) Hentai [OVACAS (広川浩一郎)] がくえんえろとぴあ 改訂版 (がくえんゆーとぴあ まなびストレート!)

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

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

(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!) [English] [biribiri]

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

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

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

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

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

(Futaket vs. ABC ~Hentaisai~) [OVACAS (Hirokawa Kouichirou)] Gakuen Erotopia (Manabi Straight!)

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