Akane is the youngest of the Four Shida Sisters and the twin sister of Aoi Shida.

Despite being twins, she is the polar opposite of Aoi, who exudes warmth. With outstanding intellect, she has difficulty holding conversations with others.

Akane has great composure and rationality, being the perfect person to consult with. However, she is bad with strangers.

(Source: OsaMake Wiki, edited)