4.441 out of 5 from 542 votes
Both Trinity Seven and Girls of the Wild's are harem series with the unusual, "down to earth" harem lead. In both of those series the main character gets transferred to a new, female dominated school, where he instantly attracts the attention of several most powerful girls (we're talking about destructive power here). Girls of the Wild's is actually a non-ecchi series and has some drama going on. On the other hand Trinity Seven is light comedy with some bits of ecchi here and there. Still, if you liked one of those, the other one might just prove interesting as well.
Both series feature a weak male lead who gradually becomes stronger under the guidance of some kick-ass girls. While Girls of the Wild's is completely ecchi free, Tsumanuda Fight Town features some fanservice (occasionally), but in the end both series really focus on martial arts. If you liked one series, you might want to read the other one too.
When Koreans make a manhwa about a guy being admitted to an all-girls school, it's not quite what you would expect from a Japanese authors. Both Girls of the Wild's and XO Sisters feature such (un)fortunate protagonist. There are some other similarities such as girls who can fight really well and an extremely good art style. However, aside from previously mentioned themes those manhwa are not very similar. Nonetheless, I hope the things I wrote do encourage you to check them out, as those are good quality series.