There is this Anime called Uraboku for short.
I recommend it to all those who are interested in relationships with each-other and how they can change due to "fate".
It´s a story were two worlds exist and the inhabitants don´t get along with each-other that well, although the conflict started within the inhabitants of the human-world. It´s kinda dark with loveable characters, each and everyone with their very own feelings and conviction and it pictures how everyone changes through interaction with another.
I´m gonna rewatch it, since the manga seems to be on a hiatus...
Luca is a Duras, something like a demon from the other world, while Yuki s a human with special powers who can heal the injured one. In his former life he was a woman and in love with Luca, who still protects him. Yuki himself has no memories of his former lifes and struggles towards his goal. I think it´s worth a watch.