This was a free Android and iOS game that was released in July 2013. Service was discontinued as of June 30, 2014.
This was essentially a card collecting/trading social game centered around the same dating/hostess club sim theme (with a lot of DLC content) as the Dream C Club console games. Besides the regulars, there were also several new hostesses (all as trading cards.) What came to my mind was a DCC version of Hearthstone. The artwork on this was actually pretty good. Some of the game artwork and hostess trading cards below.
There is potential for the DCC franchise on mobile but they need to keep their DLC pricing in check. Why the service and apps (they are no longer available for download) were discontinued is not known though (there is only a tersely stated announcement on the official website about the stop date and thanking customers for their patronage of the service. I'm thinking the expenses to run the service exceeded the revenues from DLC.
There's a lot of art assets that were made for this though not to mention the design and development of the actual game. I'm thinking some of these new characters will be brought to the next-generation console game.