The famous manga artist and video game character designer Yusuke Kozaki wrote an interesting Twitter message which included a mysterious short teaser video. In the video you can see from a project some characters and some CG events and a logo at the end but nothing exactly or official details released about the game.
Yusuke Kozaki by the way worked on some famous games like the Star of the Dragon Quest, Pokemon GO, Puzzle & Dragons so he is advanced in the video games character designing. In here you can watch the video with his Twitter message.
— コザキユースケYusuke Kozaki (@kymg) September 9, 2016