The premise, for the moment, is a bit similar to the .hack and Sword Art Online series. There's a massive VR Cyberworld called EDEN, and people mysteriously fall into a coma. And you basically investigate the cause behind it. But unlike .hack and SAO, people's consciousness aren't trapped in the VR world, as far as we know. I'm not all that far in the game yet. Only reached chapter 3 and I'm still working on some random cases.
If you really like Digimon, and you like JRPGs, I can recommend it. Been playing it for 8 hours so far, haven't really encountered any giant revelations yet, since I'm mostly busy training my Digimon, but I'm really enjoying it. If you need more encouragement, I often see people comparing this to the Persona series. And I'd have to agree, it's pretty much Persona: Digimon Edition.