With Kasai Uchiha's deteriorating eyes, she lusted after Sarada's eyes to replace her eyes and obtain the eternal mangekyo sharingan.
The two half-sisters will fight for their lives to obtain the ultimate Uchiha eye power.
The Uchiha Family lives normally until one day, Sarada got really sick. Sakura tried her best to help her precious daughter fight this illness. This also kinda explains why Sarada wears glasses! This story won't be COMPLETELY main on Sarada's Illness. It'll have other moments like for example Wedding moments. Those event will somewhat connect.