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Sora Kasugano (春日野 穹)Birthdate: February 5
Height: 152 cm
Hair color: Silver
Eye color: Light Gray
Blood type: O
Known relatives: Kasugano Haruka (twin brother)
She is a quiet, fragile and reclusive girl, and fraternal twin sister to the main protagonist. Cursed with illness and frailty since birth, Sora was denied the sort of independent life that many take for granted. Yet beneath Sora's angelic doll-like appearance lies a troublesome personality that’s prone to withdrawn laziness and demonstrates a rather severe lack of social graces. In all honesty, Sora doesn't care for anyone else, and would much rather just surf the Internet and eat instant food, for as long as Haruka is always by her side. It's implied that her strong bond with Haruka, strengthened as a result of the tragic loss of their parents, may be leading her towards fantasies of incest between twins. She hates Nao, although it is implied that they were once good friends. She is often seen carrying a rabbit doll, which she received as a present before she and Haruka left the village.
Yosuga no Sora is a romantic anime about two orphaned twins and their "unique bond". The brother twin, Haruka, is frequently running into beautiful girls at his school, much to the dismay of his twin sister Sora. Take a look at these gifs of the twins and classmates interactions.