Bonk, you silly guy. Look at the thin black line right below the upper black whatever-that-is, you can see some AA getting applied there. Overall it's just a bit of blur, really. I'd use it since it cleans up the foliage a bit but the AO is so terrible. It's a mystery why they're tied together but the reason is probably the same reason there was no option to lower or disable the global illumination that, once lowered or removed, drastically boosts performance! Silly Japanese developers. Did you find your preferred settings for the game though or take any screenshots? I was looking forward to them.