It’s been revealed through a now-deleted article from Dengeki that VanillaWare’s 2D adventure game, 13 Sentinels: Aegis Rim, will release in Japan in Fall 2019.
Earlier this year Atlus announced a “Prologue” release of 13 Sentinels that features all 13 protagonists and about the first three hours of the game’s story. This will release in Japan on March 14, so it appears that Atlus wanted to at least have a release date for the full version ready by the time the Prologue version releases.
13 Sentinels: Aegis Rim releases in Japan in Fall 2019 for PlayStation 4. The 13 Sentinels: Aegis Rim Prologue will go for 980 yen via the Japanese PS Store as well as a limited retail release.