The Koihime Musou series. (Koihime Musou, Shin Koihime Musou, and Shin Koihime Musou Otome Tairan.) One of the most longest going, and popular anime series based on a visual novel. Finally coming to a stop. (possibly?)
To start, Koihime Musou uses a lot of fanservice and comedy to keep their watchers going. If you've watched Ikkitousen, you might hear a lot of familiar names like Ryofu or Kan'u (who is actually the main char of the show.)
The anime revolves around a Chinese theme. Using quan-dos (or spears they call them,) and other really nicely dressed up weapons. Also it's during a time of war and bandits. The main character, Kan'u, is a wandering bandit hunter. So it plays out from there.
Considering I said "fanservice," yeah there's a lot to go around. Mainly having a semi-yuri them with one of the characters. (Actually two if you count the last series, alone.)
This char appears only in the last two series' and is considered on of the mains.
Many people loved the 1st series overall, had speculation of the 2nd series then loved the ending, then loved the 3rd series, overall it goes to show you that can't judge everything by 1st glance. Watch the whole entire thing from start to finish. Overall, I loved it and I give it a 4 out of 5.