Jintian Kaishi Zuo Mingxing: Tianshi Qingge

Eita Hoshizora is an 18-year-old college student who has just entered university. From an early age he exceled in singing, but a certain incident makes him unable to sing in front of others.

One day, his twin sister Karina Hoshizora, a top idol,asks him to stand on stage in her place. Unable to turn down her selfish sister's request, Eita acts by pretending to be her... but ends up upsetting her sponsors and in a situation where she could be kicked out of the entertainment world! Eita struggles to regain her position as a top idol in the special world of show business, but...

In this coming-of-age idol comedy, a sister and brother switch places and live as idols!

(Source: Nautiljon & Official Site, Edited)

Note: The recap aired in Japan on July 21, 2023 under the title Re:STARS: Mirai e Tsunagu Futatsu no Kiraboshi.