Shion and Kuon were twin sisters. One day, Shion who was an idol unexpectedly commits suicide.
However, Kuon has a hunch that Shion was killed. In order to find her killer, she enters showbiz as an extra. With the help of newbie actor Ryuuto, who is said to have been Shion's lover, Kuon investigates and one by one the darkness of the showbiz world becomes clear.