The Alliance Alive first launched for 3DS in Japan in January 2017, followed by the west in March 2018. Its development team includes staff who worked on Romancing SaGa 2 and Suikoden.
Here is an overview of the 3DS version, via western publisher Atlus:
One Thousand Years Ago, Daemons Invaded the World of Humans
They subjugated Humanity and created the Great Barrier to separate the realms. The world was thrown into upheaval, and the Dark Current was born. It carved a cross-shaped swath across the ocean, swallowing countless cities in its wake. Humanity was decimated. Hundreds of years later, Daemons rule atop a hierarchical society. However, the time for resistance has come. The world is about to change yet again…
Crafted by Legendary Talent
With writing by Yoshitaka Murayama, game design by Kyoji Koizumi, a vision realized by director Masataka Matsuura, and a stunning score delivered by acclaimed composer Masashi Hamauzu, players will experience the nostalgia delivered by these Japanese RPG greats. With gorgeous world exploration, an intertwining story involving nine memorable characters, and strategic, turn-based gameplay mechanics, players won’t want to miss this return to Japanese RPG excellence.
Built on a sprawling world replete with numerous secrets to discover, players will need to establish and unite guilds throughout the four realms while battling the Daemons. Use the “Ignition” system, a part of the turn-based combat that allows for deep customization and nuanced gameplay, to reach an enhanced state and deliver devastating Final Strikes. In The Alliance Alive, players will need to keep their wits about them and think strategically to win each fight!
Update 11:00 p.m.: NIS America will host a video presentation on March 11 where it will likely announce a western localization of The Alliance Alive HD Remastered among other new titles. Gematsu discovered the following URL—nisamerica.com/games/alliancealive—which returns an “Access Denied” page.
Update 03/06/19 at 10:18 a.m.: The latest issue of Weekly Famitsu is now available and specifically mentions that the PC version will be distributed by NIS America in Japan, while the PlayStation 4 and Switch versions will be published by FuRyu. That being said, it is safe to expect the western announcement from NIS America on March 11.