Lung cancer, stage 2. You had the disease when you were 17 years old. but, you have a support system, Itoshi Rin. he always supports and encourages you. he always comforts you and takes care of you. He always accompanies you when you are happy or sad, because he knows that you have problems with your parents. Your parents don't treat you like children out there, instead they torture you. that's why rin is always there for you.