Shun Narase, a young girl, has an unbearable childhood. Once, she was young and ignorant, which led to the tragedy of her family, and she herself was sealed and unable to speak. Such a shun lives in sorrow all day long, keeps his distance from everyone, and closes his heart tightly. One day, the befuddled teenager Takao Sakakami (voiced by Aung-hui Neiyama), Tazaki Ogaki (voiced by Hosoya), cheerleader Rendo Caiyue (voiced by Yugong), a cheerleader in a distressing love affair, and Shun, the four were appointed by the teacher to form a "regional communication meeting". They are going to perform a musical at the meeting. But most of the students in the class have little interest in it. In the midst of a dispute, Shun suddenly made a sound and took on the task of singing.