Twinkle Twinkle Idol Star

Twinkle Twinkle Idol Star (♂ティンクル²♀アイドル☆スター, Tinkuru Tinkuru Aidoru Sutā) is a manga by written and illustrated by Hikaru Toyama. It was serialized on Shonen Sunday.

Plot
Marimo Himenogi desperately wants to become an idol singer. When a local contest is announced, she begs her boyfriend, Ayumi to sing as her partner.

Other Sources

 * Twinkle Twinkle Idol Star