The elected members are chosen for a concert on Baltistar, a planet completely under the entertainment ban. Meanwhile, the 77th generation of understudies are chosen to infiltrate a nearby military base undercover in order to investigate reports of important business people visiting the base. As the concert begins, drawing out the DES forces, the understudies begin their mission and start gathering intel. During their investigation, Nagisa, Yūka and Makoto discover a hidden casino where elite members gamble on how long the concert will last. As they attempt to investigate further, Makoto inadvertently blows their cover. However, due to an apparent stroke of luck, they manage to escape to a garbage disposal and report their findings to Tsubasa. The girls decide to target the nuclear reactor hidden somewhere in the base so they can shut down the casino and escape, with Orine's team using a stolen mech to help them. As Makoto laments her usefulness, Higashino, the DES guard that helped them escape, gives her his support and helps her to shut down the reactor, gaining her own Kirara in the process.
新選抜総選挙の後、選抜入りしたメンバーたちが撮影、収録、取材と
多忙の日々を送る中、その差に気落ちする非選抜メンバーたち。
しかし、次の強襲ライブが決定し、
凪沙たち77期研究生にある重要な任務が与えられる。
それは、強制労働のために移送される少年たちの中に紛れ込み、
DGTO軍が造った軍事要塞・ベガスターの機密事項に迫ることだった。
Después de las elecciones generales, algunas de las elegidas están muy ocupadas con sesiones de fotos, grabaciones y entrevistas. En contraste, quienes se han quedado fuera están un poco deprimidas. Sin embargo, cuando se planea el siguiente concierto, se les asigna una importante misión a las aprendices de la 77° generación: fingir que son chicos enviados a trabajos forzados y descubrir el secreto de la base militar de Vegastar de DES.
