(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various) Pics (Cレヴォ27) [OVACAS (広川浩一郎)] OVACAS SKETCH (よろず)

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

(ABC 5) [OVACAS (Hirokawa Kouichirou)] Iro Iro Gal and Dou (Various)

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

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

(C54) [OVACAS (Various)] Capricon 1 Director's Cut (Various)

(C55) [OVACAS (Various)] Heppoko Anime Chinpure Koupure (Various)

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

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

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

(C61) [OVACAS (Hirokawa Kouichirou)] S.F.3.D (Various)