¿De qué trata Tu Mentira de Abril?
Kōsei Arima, un prodigio del piano de catorce años, se hace famoso tras ganar varios concursos de música. Cuando muere su madre, Saki, Kōsei sufre un colapso mental mientras actúa en un recital de piano, lo que le impide oír el sonido de su piano, aunque su audición no se ve afectada.

Dos años después, Kōsei no ha tocado el piano y ve el mundo en monocromo. No se centra en destacar en ninguna actividad y suele pasar el tiempo con sus amigos Tsubaki Sawabe y Ryōta Watari. Kōsei conoce a Kaori Miyazono, una violinista de catorce años, audaz y de espíritu libre, cuyo estilo de tocar refleja su personalidad maníaca. Kaori ayuda a Kōsei a volver a tocar el piano, y le muestra que su estilo de tocar puede ser libre y rompedor. Mientras Kaori sigue levantando el ánimo de Kōsei, éste no tarda en darse cuenta de que la ama, aunque a ella sólo parece interesarle Ryōta.

Durante una actuación, Kaori, que más tarde explica que está anémica y necesita pruebas rutinarias, sufre un colapso y es hospitalizada. Más tarde le diagnostican anemia aplásica. Invita a Kōsei a tocar con ella en una gala, pero no llega. Su salud empeora y se siente abatida. Kōsei toca a dúo con una amiga, lo que motiva a Kaori a intentar una operación arriesgada y potencialmente mortal para poder volver a tocar con Kosei. Mientras toca en la final del Concurso de Piano del Este de Japón, Kōsei ve el espíritu de Kaori acompañándole y se da cuenta de que ha muerto durante la operación.

En su funeral, los padres de Kaori entregan a Kōsei una carta de Kaori que revela que era consciente de su muerte inminente y que se volvió más libre de espíritu, tanto como persona como en su música, para no llevar sus remordimientos al Cielo. Confiesa que estaba enamorada del piano de Kōsei desde que le vio tocar en un concierto cuando ella tenía cinco años. Esto la inspiró a tocar el violín para poder tocar con él algún día. Kaori inventó sus sentimientos hacia Ryōta para poder acercarse a Kōsei sin herir a Tsubaki, que albergaba afecto por Kōsei. Entonces le confiesa su amor por él. Tsubaki consuela a Kōsei y le dice que estará a su lado. Kaori también deja una foto suya de niña, volviendo del concierto que la inspiró, con Kōsei al fondo. Más tarde, Kōsei enmarca esta foto.
Tu mentira en abril es un manga y un anime sobre la amistad a través de la música. El protagonista, Kosei Arima, es un prodigio del piano con mucho talento que sufre un colapso mental por la presión de actuar y se vuelve sordo al sonido de su propio piano. El mundo se vuelve monótono y deprimente hasta que conoce a Kaori Miyazono, una violinista de espíritu libre que le recuerda cómo volver a tocar música libremente. Sin embargo, Kaori sufre anemia y a menudo tiene que ir al hospital. A pesar de ello, los dos tocan juntos a menudo y Kosei se enamora. Kaori fallece poco después y deja una carta para Kosei en la que le explica cómo le quería a él y a su forma de tocar el piano. Kosei utiliza esto como inspiración para volver a la música y tocar libremente una vez más.
What is Your Lie in April about?
Fourteen-year-old piano prodigy, Kōsei Arima, becomes famous after winning several music competitions. When his mother Saki dies, Kōsei has a mental breakdown while performing at a piano recital; this results in him becoming unable to hear the sound of his piano, even though his hearing is otherwise unaffected.

Two years later, Kōsei has not touched the piano and views the world in monochrome. He does not focus on excelling in any activities and often spends time with his friends Tsubaki Sawabe and Ryōta Watari. Kōsei meets Kaori Miyazono, an audacious, free-spirited, fourteen-year-old violinist whose playing style reflects her manic personality. Kaori helps Kōsei return to playing the piano, and shows him his playing style can be free and groundbreaking. As Kaori continues to uplift Kōsei's spirits, he quickly realizes he loves her, although she seems to only be interested in Ryōta.

During a performance, Kaori, who later explains that she is anemic and needs routine testing, collapses and is hospitalized. She is later diagnosed with Aplastic Anemia. She invites Kōsei to play with her at a gala but she does not arrive. Her health deteriorates and she becomes dejected. Kōsei plays a duet with a friend, which motivates Kaori to attempt a risky and potentially deadly surgery so she may possibly play with Kosei once more. While playing in the finals of the Eastern Japan Piano Competition, Kōsei sees Kaori's spirit accompanying him and realizes she has died during the surgery.

At her funeral, Kaori's parents give Kōsei a letter from Kaori that reveals she was aware of her impending death and became more free-spirited, both as a person and in her music, so she would not take her regrets to Heaven. She confesses she had been in love with Kōsei's piano playing since watching him perform at a concert when she was five. This inspired her to play the violin so she could play with him one day. Kaori fabricated her feelings towards Ryōta so she could get closer to Kōsei without hurting Tsubaki, who harbored affection for Kōsei. She then confesses her love for him. Tsubaki comforts Kōsei and tells him she will be by his side. Kaori also leaves behind a picture of herself as a child, coming back from the concert that inspired her, with Kōsei in the background. Kōsei later frames this picture.
Your Lie in April is a manga and an anime about friendship through music. The protagonist Kosei Arima is a very talented piano prodigy who goes through a mental breakdown from the pressure of performing and becomes deaf to the sound of his own piano. The world becomes monotonous and depressing until he meets Kaori Miyazono, a free-spirited violinist who reminds him of how to play music freely again. However, Kaori suffers from anemia and often has to go to the hospital. Despite this, the two often play together and Kosei falls in love. Kaori passes away soon after and leaves a letter for Kosei explaining how she loved him back and his piano playing. Kosei uses this as inspiration to get back into music and play freely once more.