Your Lie in April, known in Japan as Shigatsu wa Kimi no Uso (四月は君の嘘) or just simply Kimiuso, is a Japanese manga series written and illustrated by Naoshi Arakawa. The series was serialized in Kodansha's Monthly Shōnen Magazine from April 2011 to May 2015. An anime television series adaptation by A-1 Pictures aired from October 2014 to March 2015 on Fuji TV's Noitamina block. A live-action film adaptation of the same name was released in September 2016.
Piano prodigy Kōsei Arima dominates various music competitions and becomes famous among child musicians, but also controversial. When his mother Saki dies suddenly, he has a mental breakdown while performing at a piano recital which resulted in him no longer being able to hear the sound of his piano even though his hearing was perfectly fine.
Two years later, Kōsei has not touched the piano and views the world in monochrome, without any flair or color, resigning himself to living out his life with his good friends, Tsubaki Sawabe and Ryōta Watari, until, one day, a girl changes everything. Kaori Miyazono, an audacious, free-spirited, fourteen-year-old violinist whose playing style reflects her manic personality, helps Kōsei return to the music world and shows that it should be free and mold-breaking unlike the structured and rigid style Kōsei was used to, and as she continues to uplift him, he quickly realizes that he loves her, though she already likes Watari.
However, while performing together (Kōsei having been dragged into it by Kaori), Kaori suddenly collapses after a moving performance and is hospitalised. At first Kaori says that she is anaemic and just needs some routine testing, but this is revealed to be a lie when flashes of her past reveal her collapsing and bleeding many times before.
Finally Kaori is discharged and back to her happy, crazy-self, inviting Kōsei to play at a Gala with her. However, Kaori fails to show up on the day of the Gala, and as her health deteriorates, she begins to give up on life. This time, Kōsei is the one who inspires her after playing a duet with Nagi Aiza, the pianist sister of a fellow rival of his named Takeshi Aiza. After shedding tears and listening to it, Kaori opts for a risky surgery that may kill her if it fails, just so that she can play with him one more time.