Rio Futaba

Age: 16-17
Gender: Female   

Height: 155 cm (5'1")
Talent: Explaining any strange phenomenon with science

She is Sakuta's classmate, who is always cool and calm, always willing to give various advice on puberty syndrome. She is also the sole member of the Science Club, and known as an eccentric person at the school.

(Source: Aniplex USA)