Devil Summoner: Soul Hackers is a part of the Shin Megami Tensei series, and it has never been released outside Japan until now. The original game came out in the late 90s and it shows in some of the aspects of the game, like graphics and the difficulty level.
The story takes place in future and tells the story of a group of hackers obtaining the ability to summon demons and trying to uncover the truth behind a mystic society. While the story is interesting, most of SMT fun comes from battling and collecting demons. During the battle you will have an option to talk with a demon and, if your answers are satisfactory, the demon may join your ranks or give you an item. The battle is turn-based and the trick is to use the attacks the enemy is weak to. The rate of random encounters is very high and your party may get obliterated after 2-hours spent in a dungeon, so I would recommend using the 'Save anywhere' hack rather than relying on saving only in designated places, which can be difficult to locate when you are in a new dungeon.
If you are familiar with the series and/or like dungeon-crawlers, Soul Hackers is a fun game to play but if this is your first experience with the genre, I would recommend waiting for Shin Megami Tensei IV to come out in Europe because it is much more forgiving.