Akio appears (sings/talks) in the following miscellaneous CDs.

1992 01.29	The Secret of Blue Water Vocal Collection II (TYCY-5188)	Song
1992 07.08	Scramble Wars Yami no Labyrinth (TOCT-6502)	Talk
1994 01.25	Fire Emblem (MWCG-0007)	Talk
1995 12.16	Seiyuu Daisuki 3 (MRCA-20080)	Talk
1996 04.24	Toushinden -Before Stage- vol 2 (BVCH-632)	Talk
1996 08.07	Luna Silver Story Lunatic Festa vol 1 (KACN-1042)	Talk
1996 09.04	Luna Silver Story Lunatic Festa vol 2 (KACN-1043)	Talk
1996 11.07	King of Fighters '96 drama CD (PCCB-230)	Talk
1996 11.26	Blue Seed Too (KICA-326)	Song
1997 01.08	Psychic Force drama CD (PCCB-2339)	Talk
1997 03.21	Street Fighter EX drama CD (PCCB-256)	Talk
1997 05.02	Clock Tower 2 (PCCB-258)	Talk
1997 07.21	Hyper Police CD drama (COCC-14290)	Talk
1997 08.01	Detatoko Princess vol 1 (VPCG-84633)	Talk
1997 10.01	King of Fighters '97 Drama CD (PCCB-281)	Talk
1997 11.21	Aika vol 2 Sweet Emotion (COCC-14630)	Talk
1997 11.21	Choukousoku Gran Doll (AYCM-9001)	Talk
1997 12.21	Joker File 2 (KECH-1120)	Talk
1998 04.29	Yuukyuu Gensoukyoku 2nd Album drama CD vol 2 (PCCB-313)	Talk
1999 04.05	Chiffons Jikuu Daihyouryuu Charakasu Another ()	Talk
1999 09.08	Jane Oferinaito (MACA-2011)	Talk
2000 02.25	Nadesico Oshare Club (KICA-490)	Talk
2001 03.31	Cafe Kichijouji de 9 ()	Talk
2001 06.27	Piano 1 (MMCC-6001)	Talk
2001 07.25	Piano 2 (MMCC-6004)	Talk
2005 01.31	Cinematic Sound Drama GetBackers -Legend of Vampire- (MKC-0003)	Talk
2016 09.15	Mausu Theater 002 (MAPR-0004)	Narration