Human Noah no Koe

The 12th manga of Ryokunohara Series. The manga started of with Kanata heard a girl crying for help during the night. He noticed the strange weather, the same type of weather before his parent died. He found the girl that is crying for help, and she knows him? He doesn't recognize her and have no clue why she knows who he is. Soon before Kanata helps her, she died, disappeared in Kanata's arm....or it seemed so. The next morning, that girl appear to be a new student in his school. She tries to hook up with Kanata yet isolate herself from everybody else. Why and how she is still alive? And what exactly she is up to approaching Kanata like this? What is the explanation of her behavior?