Saya

A gamer girl who knows exactly what she wants.
Saya used to live with their parents until, craving freedom and her Onii-chan, she moved into the protagonist's house together with Uya.
She hates studying and isn't doing so well at school, but she loves her Onii-chan like a good little kitty!
Clingy and needy, but keeps her distance in public. Prefers to stay in and likes nothing better than quietly snuggling up with Onii-chan when no one else is around.
Loves reading manga and gaming, and can often be found playing video games on her Onii-chan's lap.
Has a sweet tooth, but forces herself to drink her coffee black in order to appear more mature.
Tends to value style over substance; for example, she wears glasses when studying because it makes her look smarter.
Skilled with the side-eye.

"I know! Why don't I play a game? I have Onii-chan here acting as my back rest after all!"