Kousei Arima is a fictional character from the anime and manga series Your Lie in April. He is a talented pianist who struggles with the emotional trauma of his mother's death, which affects his ability to play music. Kousei is known for his exceptional skills but becomes unable to hear the sound of his own piano after losing his mother. Throughout the series, Kousei meets Kaori Miyazono, a spirited violinist who helps him rediscover his passion for music. Their relationship plays a crucial role in Kousei's journey of healing and self-discovery, ultimately leading him to confront his past and embrace his love for playing again.