Aoi is the third oldest of the four Shida Sisters as well as the twin sister of Akane Shida.

Aoi is a shy and delicate girl. She is the most feminine among the four sisters, with a hobby of sewing and a passion for sweet things, cute clothing, and dolls.

Aoi is an incredibly virtuous girl, to the point where one would be hard-pressed to find anything in her resembling a fault. However, she also has a low opinion of herself, and a tendency to conclude that she is to blame when anything goes wrong. Aoi is the kind of person who always help those in trouble.

(Source: OsaMake Wiki, edited)