Mana Nagase gets classmate Kohei Makino involved and starts her idol career in high school. She makes it to the final round of the Next Venus Grand Prix, but dies in a tragic car accident.

Mana's younger sister Kotono and a mysterious girl with Mana's voice, Sakura Kawasaki, passes the audition to sign with Hoshimi Productions. They move into the company dorms to start their path to become idols.

Kotono feels uncomfortable working as a group. When LizNoir shows up at Hoshimi Productions and gives a lesson, it helps everyone come together as a group.