Yūko starts practising a lot on the own, causing some worry among her teammates, reminding Tsubasa of how Atsuko was similarly unapproachable when she was Center Nova before she disappeared. Later, Mikako approaches Yūko, telling her that in order to become Center Nova, she will have to embrace her loneliness. The next day during a concert, a DES Battallion launches an attack on Akibastar, putting the city into chaos. Realising this isn't what she wanted, Mikako informs Tsubasa that the organisation behind the DES, Zodiac, are after an element known as Dualium that is hidden in the temple. When AKB struggle against the DES, Mikako changes the battlefield into a guerilla concert to motivate them, unaware that she's playing into Chieri's father's plan. As Tsubasa orders a retreat from Akibastar due to the escalating battle, Yūko takes it upon herself to become the Center Nova, create a large burst of energy that opens a gateway. As this light soon fades away, Yūko is nowhere to be seen.