The Truth Echoes

This is a book that I think of myself. It's about a brother that has lung cancer. His sister, Yuri, tries her best to save her brother and keep the promise that he will always be happy.
Please don't copy my work. And have fun reading my original story.
Remember to rate my story plz

More info:
Yuri/big sister-18
Takashi/little brother-10
Parents/Edward and tsubaki Matuki- both 29
Friend/ Haru-19
Friend/ Nana-18