Mayuri Shiina

Mayuri Shiina is a 16-year-old second-year student at Kasensou Private Preparatory Academy and Rintarou's childhood friend. Optimistic, easygoing, and often smiling, she does not worry much about understanding complicated theories as long as she is enjoying herself.

Mayuri dislikes arguments and unpleasant situations but is not especially skilled at reading subtle social cues. Her habit of suddenly reaching an arm toward the sky, inspired by stargazing with her grandmother, is nicknamed the “Stardust Shakehand” by Rintarou.