To take this slightly a different way, I wanted to talk about the minor elements of the story line that may or may not give the plot more depth. So to start out:
1) What is the significance of the fact that the Karas have a form similar in nature to that of a "raven" and what role does a raven play in the series given the cover contains this Kanji which means raven?
2) What is the significance of Yurine's appearance and how does this affect her roles in both worlds
3) What is the importance of the white cat that moves from one bed in the hospital to the one Otoha's body occupies?
4) What other things have you picked up on that fall under the mythological or other elemental parts of the OVAs?