Kaori’s Illness in Your Lie in April

Your Lie in April is a Japanese manga series written and illustrated by Naoshi Arakawa. From April 2011 to May 2015, the series was serialized in Kodansha’s Monthly Shōnen Magazine. 

An adaptation of the series by A-1 Pictures aired on Fuji TV’s Noitamina block from October 2014 to March 2015. In September 2016, a live-action film adaptation of the protagonist Kaori Miyazono’s story was released. 


What illness Kaori’s suffered from is uncertain, however, fans of the series speculated that she endured Friedreich’s Ataxia. As the symptoms match up with symptoms that viewers have seen in the series.

Kaori's Illness in Your Lie in April
Image source: Nefarious Reviews

Who Is Kaori?

She was Ryouko and Yoshiyuki Miyazono’s only daughter, a free-spirited, gifted violinist whose style of playing represented her personality. As a third-year student, she attended Sumiya Junior High School and was in the same class as Tsubaki Sawabe. 

When she asked Tsubaki to set her up with Ryota Watari, she met Kousei Arima. As their relationship grew, after his mother’s death, she gradually began helping Kousei return to the piano world.


She is, like Kousei, a highly talented musician. However, her style is distinct, unlike the rest of the musicians in the series. 

She modifies a song’s rhythm, tempo, and pitch frequently by free-styling. As a result, the song itself turns into a unique melody. Despite the judges’ rejection, her free-styling captivated the crowd.


The short height of Kaori Miyazono is typical for a 14-year-old. She has a slender body and blonde, wavy hair reaching down to her waist.


Kaori also has stunning, vivid, indigo blue eyes that seem to be dilated. You always see her traveling with a beautiful pink suitcase and her violin. 

As a little girl, she wore a pink dress and her hair was chin-length. She wore a pair of black glasses with thick rims during her early years in junior high school and tied her hair into two low pigtails.

Kaori's Illness in Your Lie in April
Image source: Dunia Games

Kaori’s Illness

Kaori was physically frail and had several operations. Her hospitalizations became more regular and extended, leading to her missing school and practice. She observed her mother crying in the hospital lobby one night.

She then learned that she didn’t have much time left to live, and shortly after the recurring hospitalizations and weakness grew, she understood it herself. Kaori hid her disease from everyone.

Development of Her Illness

The development of her illness was first shown when, after her first performance with Kousei, she collapsed. Kaori claimed at first that she was anemic and just needs some routine monitoring. 

Later it was revealed that after she fell and hit her head at home, she was unable to perform with Kousei. It later became apparent that her health was gradually deteriorating, and she was no longer able to conceal her condition from her peers.

Her disease started to cause episodes of leg paralysis. Often, while walking down the corridor in the hospital, she unexpectedly fell to the ground and she was unable to stand up again. 

Kousei found during one of her hospital visits that she had become pale and skinnier.

Kaori's Illness in Your Lie in April
Image source: Digital Fox Media


While Your Lie in April has been around for quite some time now, but fans still discuss this manga series.  In particular, there always theories about Kaori’s deadly disease. 

As her health worsened to a point where she was unable to stand up, it turned her into a weak, frail child. The creators of the story have never revealed what Kaori’s illness is. You’ll have to watch to see how it ends.