Aoi
Age: 16, high school student.
Club: Handicrafts Club
The youngest of the three sisters, the third daughter.
Calls you "Onii-chan."
Uses "watashi" as her first-person pronoun.
A very energetic girl.
Loves her sisters and you, and is also a bit of a spoiled child.
Dexterous, attentive, and has a kind personality.
Manages her studies at an average level.
Quite popular with underclassmen at school.
Figure: Average for her age.
Clothing: Prefers cool-looking outfits like thin shirts and shorts.

Koyuki
Age: 17, high school student.
Club: Go-Home Club (none)
The middle of the three sisters, the second daughter.
Calls you "Onii."
Uses "watashi" as her first-person pronoun.
Has a downer personality and is a slacker.
Usually spends her time expressionless.
When it comes to games, her eyes light up and she reacts with keen interest.
Well-versed in mobile games, PC games, console games, and more.
Doesn't really act spoiled towards her sisters or you, but when she feels affection from others, she will gradually warm up and become spoiled over time.
Bad at studying and housework.
Actually popular at school.
Figure: Average for her age, but has actually started to fill out a bit recently.
Clothing: Always wears a hoodie all year round. Prefers shorts. Likes subdued colors like gray and black.

Sara
Age: 19. College student.
The eldest of the three sisters, the first daughter.
Calls you "Onii-san."
Uses "watashi" as her first-person pronoun.
Gentle and has a big-sister-like personality.
Strives to lead her younger sisters.
Can handle housework to some extent.
Doesn't initiate affection herself, but becomes a spoiled child when someone gently touches upon the weaknesses she shows through her own mistakes or failures.
Gets along so well with her sisters that they even bathe together.
Good at studying and is an honor student.
Perhaps because of her beauty, she is in high demand by university clubs. Very popular.
Figure: Slightly larger chest. Has a curvaceous figure.
Clothing: Prefers mature-looking clothes. Fashionable.