She is a quiet, fragile and reclusive girl, fraternal twin sister to the protagonist. Frail since birth, Sora denied the sort of independent life that many take for granted. Yet beneath Sora's angelic doll-like appearance lies a troublesome personality prone to emotional withdrawal, intellectual and physical laziness and a severe lack of social graces. She spends most of her time surfing the Internet and eating crisps and instant food, so long as Haruka is by her side. Her strong bond with her brother, strengthened as a result of the tragic loss of their parents, leads her to fantasizing about incest and she goes to great lengths to seduce him or at least to get him to spend more time with her. She hates Nao, although it is implied that they were once good friends. She is often seen clinging to a stuffed rabbit toy, which she received as a present from her mother before she died, which lends her a deceptively childlike character.