Blurry Memories

A girl named Sakura who has a health condition- coronary artery/heart disease- decided to move to Japan in order for her to be with her Mom, then she started having weird dreams about a girl which will affect her emotional state and health condition. She will then meet people who will be with her alongside through ups and downs.These people will eventually hold grudges, envy, hatred, sympathy and will fancy her. Then eventually she'll discover unexpected truth and will be having shocking revelations. What will happen to her if she'll found out that the person she trusted the most is hiding something away from her? What will be the end? Will she be happy and have a happy ending? or is it the other way around?