Mana Nagase starts her idol career in high school and makes it to the final round of the Next Venus Grand Prix.

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

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

Kohei scouts Mei to join Hoshino Productions and it turns out that she's able to see Mana. Kotono is resistant to her addition at first, but starts to understand why it was necessary.

Kohei splits up the group, naming Sakura and Kotono as leaders and announcing the addition of new members Haruko and Rei. Sakura's group have trouble with Rei's strict dance practice.

Sunny Peace and Moon Tempest have their debut concert at Hoshimi Festival. Kohei and Mana look back on the day of Mana's debut.