Ayuuru, a girl native to a tropical region, holds crucial knowledge about the location of the legendary Blue Butterfly fish. She encounters Ushio and his companions when they seek information on this rare creature. Ayuuru interacts with the group throughout their search, including sharing a traditional local meal where she serves dishes such as bat soup. Her guidance proves essential to the group's pursuit of the Blue Butterfly fish.

**Version 2:**
A local girl of the tropics, Ayuuru knows the secret whereabouts of the elusive Blue Butterfly fish. Her path crosses with Ushio and his friends as they search for information on this legendary species. During their quest, she interacts with the group and hosts them for a meal featuring traditional local fare, including bat soup. Ayuuru's guidance becomes indispensable to the group's mission to find the Blue Butterfly fish.