 If you liked
Yuuki Yuuna wa Yuusha de Aru
|
 ...then you might like
Lycoris Recoil
|
both share the premise of a:
energetic girls who's in trouble
dark / black haired girl who insists and wants to protect the energetic girl
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Recommended by RokkanShojo
Both feature a group of female students who fights an enemy that threatens the peace of a city/area they swore to protect.
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Recommended by TheRockzSG