Sakurai Shio

"Ugh, gross. Don't you dare pull the 'big brother' card on me... Nii-san"

A girl who becomes the protagonist's stepsister after her mother remarries.
Her cooking skills are catastrophically bad, described as extinction-level disasters.
Deep down, she still remembers the marriage promise she made with the protagonist when they were kids.
Part of her regrets that they've become family, yet another part is happy just to live under the same roof.
Unable to sort out these contradictory feelings, she can never quite be honest whenever she faces the boy who's now her big brother.

Class: Hinamori Academy, Class 2-1
Height: 154cm
Birthday: August 29th
Likes: The 5-minute snooze after turning off the alarm, shooting stars
Dislikes: Cooking (hers is lethal-grade), pitch-black rooms

From Steam