The Girl Who Dies For Me [SATZU]

Minatozaki Sana was sick ever since she was born. She has a heart disease and the only way to save her is to change her heart.
She have to undergo a heart transplant enable for her to live.
Her parents is just like any other parents who will do everything to protect and save their child..
They hired a baby maker, and 9 months after, a healthy baby was born named "Tyuzu", Sana's family raised her only to die for their daughter someday.

What will happen if Sana falls in love with someone who will die for her someday?