Disgaea PC is a remake of the PSP game Disgaea: Afternoon of Darkness, which is itself a remake of Disgaea: Hour of Darkness for PS2. The PC port contains updated graphics (backgrounds only, not the character sprites), an updated UI, and Steam achievements, in addition to having all the content that was in the PSP edition. You may now use the keyboard and/or mouse to control the game as well as a gamepad.
Gameplay in this, as in all other Disgaea SRPG games, is straightforward. You fight enemies on a 3D grid, unleashing attacks, skills and magic spells by selecting such from the UI menu. Characters gain experience points after defeating an enemy. You can create characters from different classes as you go through the game, unlocking new classes by meeting specific requirements. Storyline characters will also join your party. You can upgrade weapons/accessories/armor/items by progressing through a randomly-generated dungeon known as the Item World, and there is a great deal of post-game content to do once you finish the main storyline.