If you are just looking for ones focused on friendship, I can recommend you D.C. Da Capo II and Sharin no Kuni. The story completely different, but friendship is a very important point in both, particularly in Sharin no Kuni.
And if you play japanese ones too, I can recommend you Tsujidou-san no Jun'ai Road. Before you say something that it completely reminds you of Majikoi, it's from the same developer I'm playing it right now too.