Walkure Romanze

Similarities: Both involves girl in the higher echelons and guy in the lower class of the school's hierarchy. Both involves childhood friends attending the same school. Both have the same awkward situation where the main character has a bad start. Both have the same harem, school, romance and ecchi genre. Dissimilarities: In one anime the girl's school uniform is way too hot for the girls, while in the other anime their school uniforms makes them girls look like grannies. One has an extra action genre while the other has comedy. One started as an eroge game, while the other.....I don't know.  

Jousting and Flying Circus: Ao no Kanata and Walkure Romanze are anime based on a visual novel focussing on an unusual sport. Walkure Romanze is about jousting, while Ao no Kanata is about a made-up sport called flying circus. Furhtermore, both anime have a very similar premise: a pink haired girl with no experience or whatsoever in the sport are challenged for a match with an experienced oujou-sama girl; however the newcomer seems to be very talented and beats the oujou-sama. Walkure Romanze is more ecchi, Ao no Kanata looks more promosing so far. 

Both shows are set in a medieval-like environment where the students are attending school specializing in training animals. In Walkure Romanze, the school is for jousting where the characters ride horses, and in Dragonar the school is for dragons. Both male lead characters suffered extreme physical pain prior to the start of the show. Fanservice is also a big part of both shows.