Let me retell this with more improved english skills:
Kira and Ria both have special powers that were past down in their family. Kira has the abilities of "Black Angel" while Ria has the ones from "White Angel".
However their powers to transform into these angels are locked in a special way. The twins can only use it when they are sure on which side they stand. Kira unlocked her abilities when she joined an evil organisation.

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