If you liked
Black Bullet
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...then you might like
Engage Kiss
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I'm surprised nobody made this recommendation because out of all recommendations these 2 are the most similar to each other. Both anime feature the protagonist working with a younger girl with special powers to fight monsters in a particular city. Both anime have multiple private agencies working for security of the city. Both have very similar character relationships. In both anime , the protagonists work for the agency of a slightly older childhood friend who they like. Black bullet is a bit darker but Engage Kiss has more slice of life scenes. Black bullet is set in a post apocalyptic world while engage kiss has a futuristic setting. Both protagonists are searching for their parents who they lost at an early age in a similar way. In both anime the Protagonist, the loli and the childhood friend share a bond and work together to protect their city.