We have one of the best if not THE best exponent of the golden era of hentai, the 90's. Character design is VARIED, not like we usually see in 2000+ anime; we have the common niche personalities and girls who look more of age than what modern anime fans nowadays are accustomed to see (loli bodies and loli-pitched voices, even when they're over 18). We also have the comedy factor, an element that has been long lost in hentai and when tried to implement in newer series they simply don't manage to fit the genre very well. All in all, animation isn't laid-back, music does its job,and characters have that aura one is attracted to, factor which was lost since 1999 approximately.
A definite must-see.