 If you liked
Toaru Majutsu no Index Gaiden: Toaru Kagaku no Railgun
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 ...then you might like
Iris Zero
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In both Iris Zero and Railgun, there exists powers that defies the natural law of order. Their story concentrates on characters with these powers and the roles they play. Both series adapts mystery as well relating to the many origins of their settings, powers, and characters themselves. The main female protagonist also has a past that has connections to the present story.