Showtime! Uta no Oneesan datte Shitai
English title: Show Time!
Japanese title: しょうたいむ！～歌のお姉さんだってしたい
Type: ONA
Episodes: 8
Source: Manga
Genres: Hentai
Studios: Rabbit Gate
Producers: Studio Mausu, Suiseisha
Duration: 6 min per ep
Rating: Rx - Hentai

The story begins when Shouji Fujimoto, a widowed single father who aspires to be a picture book author, encounters Minami Takasaki, a singing idol on the children's educational show Oneesan to Utaou! (Let's Sing Along With Our Songstress!), outside work. As a television idol for children, Minami is lonely in her private life and is not allowed to fall in love. Any scandals are absolutely prohibited. Thus begins an adult love story with a songstress.

(Source: ANN, edited)