Chapitre 157: Sometimes the answer is obvious and yet-  

Evengeline Rodwich was the fourth official daughter of Count Melheim. Though the other official daughters were supposedly her sisters- she never felt attached to them, apart from one: Kyrstal Rodwich. Besides, the eldest two were already wed off by the time she turned five. 

Krystal was Eve's older sister and loved her dearly, she was the only one who spent enough time with Eve. Eve also loved her but not to that extent- at least she hadn't realized, until that incident. 

Seven years ago, a room had caught fire in the Rodwich house- the room belonged to Krystal and at the time of the fire- she was in there. 

This was impossible on various terms. First, Krystal had special powers and that powers were enough for her to stop the fire, meaning someone probably preplanned this whole thing.