Extremely excellent. Solid writing and themes with a lot of layers to them. Good visuals and strong use of 3D cg environments.
My only problem encountered was that the "teaching" minigame seemed to have some mouse issues, specifically registering clicks outside the window despite the pointer theoretically being captured. However I thought the added effort this took to overcome worked well with what was being represented, so it did not impact my enjoyment at all.
Absolute must-buy especially if you are familiar with Yames. I consider this their strongest showing yet.