Kairi Shinonome's younger twin brother, Anri, has been dressed as a girl since birth by their mother. One day, Anri goes to an idol audition. Kairi cross-dresses as well to go and stop him, but unexpectedly they both end up scouted as idols!

Nanami Kousaka wants to be an idol, but he keeps getting turned down at auditions because of his overly cute appearance. He is approached by a producer, Kouichi Kitami, who gets him to debut as Mi-Na while crossdressing.
(Source: MU)