Total Recommendations: 1
If you liked
Mahou Shoujo Tokushusen Asuka
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...then you might like
Cop Craft
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Although in a gritty magical girl setting, the general synopsis is fairly similar. Both worlds suddenly have a mysterious gate that opened up in the human world, bringing in fairies and monsters alike. Humans and supernatural creature begin orchestrating crimes, and there's a force to oppose them etc.