Ge-Ten - Sengoku Nobunagaden Geten / ＧＥ・ＴＥＮ ～戦国信長伝 下天～ (PC-98 - 1991)
Cover art (Source: credited in a paper ad)
Hokkaidō Rensa Satsujin: Okhotsk ni Kiyu 98 / 北海道連鎖殺人 オホーツクに消ゆ98 (PC-98, Disk & Book series version - 1992)
cover art (Source: credited in the manual)
Senran / 戦乱 (PC-98 - 1995, PS1 - 1996)
Cover art / promotional illustration (Source: credited in a paper ad)
Sweet Home / スウィートホーム (Famicom - 1989)
Cover art (Source: credited in the booklet of the movie's OST)
Taikai Nobunagaden - Ge・Ten II / 大海信長伝 下天II (PC-98 - 1993, PS1 - 1997)
Cover art / promotional illustration (Source: credited in a paper ad)
Ys II / イースII (PC-88 - 1988)
Cover art: statue illustration (Source: credited in a tweet posted on Falcom's official account)
.Also used for:
_Ys: The Vanished Omens (Mark III - 1988)
_Ys I-II (PC Engine CD - 1989)
Ge-Ten - Sengoku Nobunagaden Geten
Hokkaidō Rensa Satsujin: Okhotsk ni Kiyu 98
Senran
Sweet Home
Taikai Nobunagaden - Ge・Ten II
Ys II