Pastel Memories started off as a Japan-only mobile title, but proved to be so popular that it spawned a manga and anime series. Since it's Japan-only, I have no idea how it is. The story is interesting though. 

"In the year 20XX, manga and anime culture has been gradually disappearing from Akihabara. This is the result of a malicious that infects the world of various fictional works and destroys them, along with anyone's memories of them. Standing against this are the members of the Rabbit Shed Shop café, who possess the ability to travel into the worlds of each series in order to stop the virus."

20XX, like Mega Man? Sweet. Anyway, it's the anime we're discussing. It's really good and really popular, and I suggest you all watch it. Especially for the ending. 

I'm just gonna let that sit on its own. It's one of the best endings I've seen in a while.