 If you liked
Black Bullet
|
 ...then you might like
Gokukoku no Brynhildr
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Both series feature cute girls in the main cast that have special abilities, live apart from or are shunned from society, and have shorter than normal life spans. Both shows also have the MC treat these girls as regular people and he helps them experience just being human. This in turn endears him to them. Although the plots to the two series are quite different, this underlying theme is present in both shows.