I usually hate stories about weak girls who let everyone push them around and bully them, but I find myself loving this one since the first chapter. Even though she's weak, she stands up to protect her friends and seems to progress into a stronger person. Her naivete and kindness combined with the antics of the three boys make the story funny and cute.
I'm a sucker for these types of mangas with the mixer of reverse harem, comedy, and romance.