Lovely complex!

 Story: Lovely★Complex is a love story between a boy and a girl. The girl, Risa Koizumi, is 172 centimetres tall—much taller than the average Japanese girl. The boy, Atsushi Ōtani, is 156 cm—way below the height of the average Japanese boy. Because of this, they are called the "All Hanshin Kyojin" after a popular comedy duo that has a similar height difference.

During summer school, a very tall student named Ryouji Suzuki (from another class) shows up and Risa immediately falls for him, as she has had bad luck with boys in the past because she is tall. There is a girl that Atsushi likes as well, so Risa and Atsushi decide to put aside their differences and help each other get their love interests. But as they get to know each other better, Risa's feelings for Atsushi begin to blossom, and her love life gets complicated from there.

 One notable fact about Lovely★Complex is that instead of speaking standard Japanese, almost all characters speak in Kansai-ben. While having one or two characters speaking Kansai-ben is common in many anime shows, having all characters doing so is unusual in media produced for a nationwide audience.
http://www.youtube.com/watch?v=lvG4AqnYrUo&playnext=1&list=PL56F6A32E178BC5E0&index=75