 If you liked
Ookami-san to Shichinin no Nakama-tachi
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 ...then you might like
Hidan no Aria
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A stubborn girl partners with her unlikely "prince" in fighting crime.
Both series are first of all, done by the same studio.
But beyond that, both series contains action, comedy, and drama. Of course, later on, there is romance that develops in a tsundere way between the main character and the heroine.
Additionally, both series have open ended episodes which may lead up to a season 2 possibly in the future.
There are problems around the city when it is either criminals, bullies, or receiving people's task. The main characters is introduced as a girl who have a stubborn/tsundere personality, but really persistent when engaging a fight, while a boy usually a weak minded character, steps up his abilities and became a valuable fighting assistance. Romance can be scene, but usually minor.
Aria is basically using guns in fighting enemies, as well as a male character is in equal of the female character. Okami-san is using fists in fighting enemies, as well as the male character is usually weak, but gradually improves later on.