Based on the concept it's Visual Novel game, the storyline was slightly waves off compare to the Visual Novel's to lower the content. (As the Visual Novel is rated 18+ (PC) and 15+ (PS2))
Still, it contain quite a handful of iichi stuff and some erotic scenes in yuri terms. Still it kept some original parallel concept on the 'Three Kingdoms Novel' - E.g. in the original Three Kingdom, Sou Sou (Cao Cao) has a vision/dream of 'collecting' the most beautiful women from around the Han world to himself, while the Visual Novel version also has the same vision/dream, but in a 'different' manner as she is a she.
Nether the less, the storyline are straight forward and direct. I would say that the production team did some good job to try to maintain some of the 'essence' while covering the others. It is entertaining and enjoyable.