Kage kara Mamoru!, Asu no Yoichi! Recommendations
Both have a very simular theme based around a boy samurai or ninja who is surrounded by girls, clueless to the fact that one or more like him. Nijuu Mensou is probabbly geared more towards girls, while Asu no Yoichi is geared more towards boys... and has panty humor in it.
Romance, comdey, and action are what these anime's shout! If you're in the mood for a harem-anime with feisty heroines and strong but also comical heroes, then these anime's would certainly suit those craving and the opening songs are just so cute to boot!!! Two of the best anime harems I've ever seen.