If you're looking for manga similar to Samurai Harem: Asu no Yoichi, you might like these titles. All recommendations are made by Anime-Planet users like you!
Those two series reminded me of each other due to the fact that both sport a country bumpkin male lead who is clueless about modern world and who moves into a city. Both of those series are supposed to be romance and harems at that, but from the perspective of a typical shounen harem series, Tokyo Innocent could pass for a non-harem shoujo. On the other hand Asu no Yoichi! is a prime example of a harem series. Personally I think Asu no Yoichi! is not a good series, while Tokyo Innocent is actually a good read, but for the reasons stated at the beginning, I'll still leave this as 2 way recommendation.