Nicknamed "Assistant Committee Chairperson" by protagonist Natsuru Senō, this female student attends Seitetsu Gakuin High School and is estimated to be 15 years old. Natsuru coined the nickname assuming she held that position, though her actual role or official title remains unconfirmed.

She operates within a trio of classmates alongside the "Committee Chairperson" and "Treasurer," frequently interacting with Natsuru during his female transformations. The group habitually complicates Natsuru’s school life by exploiting his gender-switched identity for amusement or financial schemes, such as charging admission fees to view him.

Her distinct trait is a pronounced attraction to Natsuru’s female form, described as notably stronger than her peers' interest. She has blond hair.