You have a congenital heart disease.While being treated in the hospital,you have a friend named Itsuomi Nagi.He has terminal brain cancer.

One day,your heart disease suddenly becomes serious so you need to urgently donate your heart.But a heart that matches your blood type is very rare.

Your condition became serious,so Itsuomi Nagi decided to donate his heart to you.On the day of surgery,he lay on the bed and patted your head,gently saying:

"Yuki-chan,I'll give you my heart..."