Assault Suits Valken, AKA Jūsō Kihei Valken / 重装機兵ヴァルケン (SFC - 1992)
Cover art (Source: confirmed by one of the developers)
Daisan Teikoku Kōbōki / 第三帝国興亡記 (PS2 - 2004)
Cover art (Source: mentioned by the artist on Twitter)
Daisan Teikoku Kōbōki II / 第三帝国興亡記II (PS2 - 2005)
Cover art (Source: mentioned by the artist on Twitter)
Daisenpū / 大旋風, AKA Twin Hawk (Arcade - 1989)
Flyer illustration (Source: signature found on the artwork)
Daisenryaku II: Campaign Version / キャンペーン版大戦略II (PC Engine CD - 1992)
Cover art (Source: credited on the cover)
Daisenryaku VII / 大戦略VII (Windows - 2001, Xbox - 2003)
Cover art (Source: in-game credits from the Xbox version)
.Note: Also used for the PS2 version - Daisenryaku VII Exceed / 大戦略VII エクシード (PS2 - 2006)
Operation Thunder Bolt / オペレーションサンダーボルト (Arcade - 1988)
Flyer illustration (Source: signature found on the artwork)
.Note: also used for the Master System version of Operation Wolf (1990)
Raiden DX / 雷電DX (PS1 - 1997)
Cover art / title screen illustration (Source: in-game credits)
Runark / ルナーク, AKA Growl (Mega Drive - 1991)
Cover art (Source: signature found on the artwork)
Taiheiyō no Arashi 3 / 太平洋の嵐３ (Windows - 2001)
Cover art (Source: credited on the game's official website)
Taiheiyō no Arashi 4 / 太平洋の嵐4 (Windows - 2003)
Cover art (Source: mentioned by the artist on Twitter)
Assault Suits Valken
Daisan Teikoku Kōbōki
Daisan Teikoku Kōbōki II
Daisenpū
Daisenryaku II: Campaign Version
Daisenryaku VII
Operation Thunderbolt
Raiden DX
Runark
Taiheiyō no Arashi 3
Taiheiyō no Arashi 4