Not precisely a sequel to YES, it's certainly expanded significantly. Same basic set-up as the previous game, it's a bunch of look/see/think style linear adventure segments that you select from the main menu. 8 Scenarios now, and about 3 times the CG, including the interesting feature that the different segments appear to have different artists and art styles.

Control is via the mouse, there's a save/load option as well, that menu is accessed via right-click.