From MangaHelpers:

Ninagawa Mio is a tough biker-gang "yankee" girl. One day, while rescuing a child from an oncoming bus, she accidentally crashes her motorbike into a very expensive car. To make up for it, the owner Saga demands she come to meet him alone. Mio has no idea what to expect at this meeting, and is bewildered when she finds herself entered into some contest called "Dorukon." "Dorukon" is apparently a popular audition competition show, where the winner gets an idol debut, but Mio is not just there due to her possible latent talent. Saga, the producer of the show, has been receiving threats that the victor will be killed if the broadcasting of "Dorukon" is not stopped. He's decided to press Mio into service as his inside detective, since the threats may be coming from someone within the show.

Now Mio is a contestant, along with the former child actress Kujou Ichika, the hot guy Satou Koushirou, sexy Yae Sumire, innocent Shimizu Nana, and chubby, bespectacled Gotou Yuuki. While dealing with all the "Dorukon" challenges, Mio has to help unravel the mystery before someone gets killed! [tethysdust]