Eita Hoshizora(Qin Ze in Chinese) 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(Qin Ya in Chinese) , 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!