User blog comment:Octofan/Original Sin Story -Act 2- Booklet/@comment-14867007-20130911171349

"A girl whose love for her brother burns jealously"? If memory serves me right (which it sometimes doesn't >.<). Unlike Elluka, Irina never showed concern or regret for the events that occured to Kirill. In the end, the one Irina's cursing is Elluka but if she loves her brother that much wouldn't she have wanted revenge for what happened to him as well?

Maybe this could before Irina became sinister and her personality changed? Then she just stopped caring about her brother?