Trial of Endurance

I don't know how to put this, but Kaessi turned out to be not Kaessi at all! She is actually two sisters – Kanerah and Kalikke, who can "replace" each other. In fact they can't help it! A devious devil named the Forefather put the sisters to a trial, and it's not clear whether their divine patron is going to somehow punish them... What's going to happen next?