Sakura Rein

Liked food: Bagels
Disliked food: Tomatoes, carrots, bell peppers

A girl in the same year as the main character at his school. She’s a blonde girl who’s half-American from her father’s side. Both of her parents have already passed away, and she currently lives alone at her maternal grandmother’s house.
She has high IQ, and is particularly skilled in regards to computers and network management. She doesn’t have much in the way of social ability due to being a shut-in that plays video games all day, and will often either say cringey things that a middle-schooler would say or speak like a highly intellectual adult.
She’s not one to really admit it, but she’s actually quite lonely, and longs for a warm family.

Spoiler

Her biological father is Paul Grey, founder and CEO of Citron company.