In the beginning of the PlayStation 3 era, all PS3s had the ability to play PlayStation 2 games. Then, all of the sudden, a new wave of PS3s were released and the full backward capabilities were taken away and replaced by software emulation. PS2 games could still be played, but not the full library. Then, another wave of PS3 games came out and the ability to play PS2 games went away completely. Sony must have kept in mind that gamers wanted to play PS2 games, because high definition upgrades to PS2 games have started appearing in collections. It was not until recently when a new part of the PlayStation Store opened for PS2 games that are not re-mastered, but released in their full PS2 glory.
One of the first games to be released this way is Grim Grimoire by NIS.
With these released to the store, they are not on the same field as new releases or even re-releases. Those all have received the High Definition treatment. The PS2 Classics (as they are referred to in the PSN store) are PlayStation 2 games in their full PS2 glory with no updated graphics, trophies or gameplay elements. The bugs that were in the game before are still in there now. One of the best perks of having games released and downloadable is not have any load times. This is a major plus for buying the released game.
Grim Grimoire's main character is Lillet Blan: a female mage who just been accepted in a school of magic called the Tower of Silver Star. Grim Grimoire gameplay is through a four-day period — because on that fifth day, everyone in the school dies. It is up to Lillet to find out what happened and why. During each of the four-day periods, any type of magic or skill that has been learned is retained. Lillet has the option to talk to her professors, classmates and discover the secrets about the magic school.