Currently in development using the Soft Engine
http://www.dualshockers.com/2015/08/...osuke-hayashi/Hayashi-san mentioned that a sequel of the games featuring Dead or Alive heroines during a vacation at a tropical island has been a prominent request from the fans. Until now he used to behave like he was ignoring those requests, but while he isn’t able to provide more details, today he wanted to announce that the game is actually in development.