倉山 沙耶

Aya's twin sister.
Saya is a reserved young lady who enjoys painting. She aspires to be an artist one day. At first glance, she looks cold, but she is actually a motherly figure who takes care of her family.
She is also somewhat strict, attempts to keep her uncle on the right track, and often scolds him for his indecent behavior.
Both sisters are currently maturing, straddling the gap between childhood and maturity.
During the course of the story, she gets her first period.