Dark Kingdom / ダークキングダム (SFC - 1994)
Illustrations (Source: in-game credits)
Gain Ground / ゲイングランド (Mega Drive, Master System - 1991)
Cover art for the Japanese and European versions (Source: Sega TV Game Genga Gallery)
Golden Axe III / ゴールデンアックスIII (Mega Drive - 1993)
Cover art for the Japanese version (Source: Sega TV Game Genga Gallery)
Pro Yakyū Super League CD / プロ野球スーパーリーグＣＤ (Mega CD - 1992)
Cover art (Source: Sega TV Game Genga Gallery)
The GG Shinobi II / The GG忍II, AKA Shinobi II: The Silent Fury (Game Gear - 1992)
Package and logo design for the Japanese version (Source: mentioned by cover artist Ryo KUDOU on Twitter)
Dark Kingdom
Gain Ground
Golden Axe III
Pro Yakyū Super League CD