Kanji Name     柊 つかさ
Romaji Name     Hiiragi Tsukasa
Gender     Female
Age     16→18
Status     Alive
petsa of Birth     July 7
Blood Type     B
Height     157 cm (5 ft, 2 in)
Job     Shrine Maiden

Tsukasa is the younger twin sister of Kagami Hiiragi and lives in a six-member family household with her parents. She is always compared to her twin sister, who generally does better than her in most areas. When she and Kagami were accepted to Ryōō High School, she was placed in Nanako Kuroi's class and met Konata Izumi and Miyuki Takara, while her sister was put in a different class.

Although not academically inclined, Tsukasa puts effort into her schoolwork and tries her best. She is however very good at tahanan skills like cooking and sewing. Tsukasa is extremely talented at cooking and will often bake treats and cook meals, making elaborate lunches for school and even custom Valentine's tsokolate for her friends. She hates horror movies, although she often gets into situations where she has to watch them. She is happy-go-lucky and always tries to be cheerful and kind.