Compile Heart announced at the "Dengeki Game Fes 2019" event on Saturday that it is developing a new game in the Neptunia franchise titled Game e Ninja Neptune. The company did not reveal any other information about the game project.
The company also revealed it is developing another new project (or projects) for the franchise outside of the game, but did not reveal any other information.
Compile Heart also announced at the event that it is producing a new original video anime (OVA) project for the Hyperdimension Neptunia (Chō Jigen Game Neptune The Animation) television anime series. The series originally aired in 2013.
The most recent game in the Neptunia franchise is Super Neptunia RPG (Yūsha Neptune: Sekai yo Uchū yo Katsumoku se yo!! Ultimate RPG Sengen!!). Quebec-based video game developer Artisan Studios developed the game, and is the first Western studio to develop a game in the franchise. The game launched in Japan for the PlayStation 4 on December 20, and Idea Factory International will release the game in the West this spring for the PS4 and Switch.
Source: Dengeki Game Fes 2019 livestream