Punished by the curse of immortality Amu watched everyone she liked die. Over the time she learned to life with it, trying not to befriend with mortal people.
But just because she isn't human doesn't mean she isn't falling in love. She feel in love once, seeing him die in the end and waiting for himto come back.
After finally meeting with him again she tries to stay away from him. Not because he was reborn as a human again.....but because he's a student at the school she's working at.
Only problem is... he of course feel for her, like he used to in his past lives.