Dayo was kidnapped by the Red Bamboo and taken to Devil's Island as a slave to create an Ebirah repelling fluid for them. Dayo escapes shortly after arriving on Devil's Island, and meets the other protagonists, who find shelter in a cave where they discover the dormant Godzilla. When the group decides to infiltrate the Red Bamboo's base, Dayo comes along. inside the base two of the protagonists are captured, leaving only Dayo, Yoshimura, and one other person free. It is then decided to wake up Godzilla using some copper wire Dayo found in the Red Bamboo base and an Infant Islander's sword as a channel. When Godzilla wakes up, one of the other protagonists named Ryota, and his brother Yata return to Devil's Island to aide the captive Infant Islanders. Shortly after Godzilla is spotted near the Red Bamboo base, they activate a nuclear bomb to destroy Godzilla. At this time Dayo and the rest of the Infant Islanders' prayers are answered and Mothra comes to safely remove Dayo, the Islanders, and the other protagonists from the doomed Devil's Island.
- Dayo was originally going to be played by Noriko Takahashi, but she was eventually replaced by Kumi Mizuno.