Haruka's twin sister. She has a weak body so Haruka is always looking after her.
Haruka's twin sister, who has a weak body and often is forced to stay home because of this. She spent most of her childhood in the hostipal, she is allowed to come home. She develops incestual feelings for Haruka but keeps them hidden from her for a long time.
Sora is easily jealous and doesnt like certain women to be around Haruka. She once witnessed Haruka having sex with one of their friends, it scarred her deeply and hates this girl to this day.