A high school girl that often gets mistaken for a middle or primary schooler. After seeing Marin's cosplay, Sajuna decides she wants Gojou to make clothes for her cosplays as well.

She mostly cosplays as magical girls or primary schoolers. Instead of going to events to show off her cosplay, she prefers to post pictures of them online. Her photoshoots are usually done with the help of her younger sister, Shinju.