Question: does kaori die in your lie in april manga

Answer: Yes, Kaori eventually dies due to the surgery, but leaves a letter to Kōsei, which is given to him by her parents at her funeral. The letter reveals that she was in love with Kōsei the whole time, and that her supposed feelings towards Watari were fabricated in order to get closer to Kōsei without emotionally injuring Tsubaki, who also has limerent feelings towards Kōsei. Although at first consumed with grief, Kōsei finds comfort in Tsubaki, who promises not to abandon him.