Konata (the girl on the left-side of the photos) has stubble on her mons pubis, so she definitely shaves on the sides and probably trims down the center too. It would be interesting to see just how full a bush she would have if she let it grow, but maybe she's self-conscious about it.
On the other side, Lulu's bush seems to grow naturally as just a thin patch at the center of her mons. And given the length of some of the individual hairs, she probably hasn't touched it since puberty.