Brother Sun Sister Moon  

ブラザー・サン シスター・ムーン

Youta is in high school but hasn't undergone voice change yet. He has a twin sister who possesses drastically different traits from him, such as being a confident new singer in the entertainment industry. Despite admiring her, he believes that he will never be able to match up with her talent. However, his sister falls ill and requires surgery. As a result, Youta is indirectly forced by her manager to impersonate her until she fully recovers. This narrative explores Youta's journey of self-discovery as he navigates through these challenges.