(SC16) [Ovacas (Hirokawa Kouichirou)] Nichiyou Asa no 8-ji 30-bu (Ojamajo Doremi)
(C56) [OVACAS (Various)] Dore Mix (Ojamajo Doremi)
(CR27) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH (Various)
(C61) [OVACAS (Hirokawa Kouichirou)] S.F.3.D (Various)
(C57) [OVACAS (Hirokawa Kouichirou)] Doremix Deluxe (Ojamajo Doremi)
(C62) [OVACAS (Hirokawa Kouichirou)] OVACAS SKETCH 4 Sokuon (Azumanga-Daioh)
(Puniket 6) [OVACAS (Hirokawa Kouichirou)] AxA (Ojamajo Doremi)
(C75) [Ovacas (Hirokawa Kouichirou)] Ovacas Style 2008 (Kannagi, Queen's Blade, Strike Witches)
AxA
[OVACAS (Hirokawa Kouichirou)] Kashi 1114 (Ojamajo Doremi)