Divine Sealing
From Sega Retro
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Divine Sealing (ディヴァインシーリング) is a pornographic shoot-'em-up by Studio Fazzy for the Sega Mega Drive, most likely made in 1991 (although the game itself doesn't say). It was one of the earliest unlicensed Mega Drive games, and appears to come from Japan. The game intersperses hentai scenes with lots of text in between each level, though the levels themselves have nothing inappropriate in them. Due to the lack of a TMSS VDP check, the game will only work on most Model 1 Mega Drives.
During gameplay, 
shoots, while 
is used to advance in the cutscenes. Every 10,000 points you earn a shot upgrade and an extra life.