Himea Saito

Himea is a vampire with great powers and when she meets Taito, she falls in love with him. She puts a curse on him so that he will always be with her, but she is abducted by a strange boy and Taito loses the memories of their encounter for some years due to a spell.

Himea fell for Taito, because he was the only one who didn't want her because of her vampire powers. This was probably because Taito didn't know that Himea is a vampire.