The MSX version was released two years after the other versions due to the MSX's status as a cheaper and inferior machine compared to "the big 3" (PC88, FM7, X-1).
This is one of the first adult themed Japanese adventure games.
Though the contents are rather rough and its status as an adventure game is questionable, it got quite popular and received many sequels.
An improved version was released later which was adapted to the developer's 3rd party sound board, "Jast Sound". This allowed the game to speak in a rather clear human voice.
Additionally, a "bangai-hen" version was released. it was not an expansion but simply a standalone slide show of in-game porn scenes.
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