The 4th Unit is a series of “point and click” graphic adventures published by Data West in Japan for CD-Rom PCs and Fujitsu FM-TOWNS. It seems that athe sixth chapter called “Merry Go Raund” was also planned for the Sega Mega CD, but it was never released for some reasons. Thanks to Myfishbone we were able to save a promo page about the cancelled Mega CD version, a translation of the main plot and a list of the developers!
Images:

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(3 votes, average: 4.33 out of 5)![Last Action Hero [Sega Mega CD – Cancelled] Last Action Hero [Sega Mega CD – Cancelled]](https://www.unseen64.net/wp-content/uploads/2010/04/last-action-hero-sega-cd-01-150x150.jpg)
![Pop’n Land [Sega Mega CD – Cancelled] Pop’n Land [Sega Mega CD – Cancelled]](https://www.unseen64.net/wp-content/uploads/2011/09/pop-n-land-mega-cd-egm51-1-150x150.jpg)
![Bounty Hunter [Genesis / Mega Drive – Cancelled?] Bounty Hunter [Genesis / Mega Drive – Cancelled?]](https://www.unseen64.net/wp-content/uploads/2011/03/bounty-hunter-gen-gamepower21-150x150.jpg)

http://www.gamengai.com/bn_inf.php?id=40
Maybe it was canceled due to the poor sales of their Psychic Detective Series of games?