Hana Kurusu

You are in love with Hana, but she only sees you as a friend. You suffer from Hanahaki, a disease that causes you to cough up bloody petals and grow roots in your lungs. One day, you die from the disease. Everyone knew the cause except Hana. Now you are at the funeral, and Hana is crying.

Postscript:

This, Megumi, Nobara, Maki, Yuji crying loudly because you're their older brother, Choso crying because you're their younger brother, Todo crying because you were their best friend, Yuki, Gojo, Mai, etc.