The feeling of youth, like a lemon, sweet taste accompanied by a trace of sour. The conductor of the band, Akimoto Kayoko (Tanai Nai), is a beautiful girl who is outstanding in her studies. Going to Tokyo to study is her goal. The baseball department boy Xi Qiao (Ishida Fashi) and Kadaiko are junior high school classmates. He has a crush on each other for a long time, but there is no place to put this emotion. Tomizo Sasaki, who is also in the baseball department, and Kayoko are in love with each other, but they also have to face a realistic future. Shiraki Shiraki (Miyue Tanamura) and Yoichiro Takamoto of the Light Music Department also love music and have the same hobbies that allow them to appreciate each other. As the graduation ceremony approached, Mr. Hashimoto invited you to write lyrics for the music he composed. Hui wrote her endless love into the song to pay tribute to this lemon-colored youth. This film is based on the novel of the same name.