The members of S.M.S Macross Quarter investigate the truth behind the destruction of the 117th Large Scale Research fleet in a Vajra attack and Ozma finds the shadow of O'Connor's ambition present in the incident where Ranka lost her family. A photo also confirms that Sheryl is Mao Nome's biological grand-daughter. Meanwhile, the NUNS military forces of Frontier prepare for a final decisive battle to protect the fleet from the Vajra. Alto visits Sheryl before the battle and promised that he will come back to her alive, but Sheryl interrupts him with a kiss. She then begs Alto to save Ranka and gives him her last fold quartz earring.
The Macross Frontier fleet finally arrives at the Vajra home system and starts its final attack by successfully destroying a large portion of the enemy using "Dimension Eater" weapons. However, O'Connor connects to the Vajra fold network and manipulates Ranka into leading all the Vajra against the Frontier fleet with her singing, which also enhances their effectiveness in battle. Alto's VF-171EX is destroyed by Brera's VF-27 while Sheryl watches helplessly from the stage at the Battle Frontier bridge.
