The bird-shaped island of Ootorajima island where Big Falcon was located on was surely attracted the Boazanian's attention. Dr. Mitsuyou was at the grave of her husband, Dr. GOU Kentarou. She had a flashback of the time when Dr. Kentarou left his family. Suddenly the beast fighter attacked Big Falcon and she was injured during the attack. When fighting the beast fighter, Voltes fell into dangerous situation. The injured Dr. Mitsuyo forced herself to fly an airplane and sacrifice herself to help her children.