OVA
Description
Tsukasa Hiiragi is the younger fraternal twin sister of Kagami Hiiragi and the youngest in her family, which includes parents Tadao and Miki, eldest sister Inori, and middle sister Matsuri. She attends Rōyō High School alongside Konata Izumi as classmates, where she struggles academically due to forgetfulness and poor concentration, frequently relying on Kagami for homework help. Born on July 7, Tsukasa stands approximately 157 cm (5'2") tall and has blood type B.

Her personality radiates sweetness, naivety, and gentleness, marked by an innocent nature and a near-total inability to feel anger – a stark contrast to Kagami's tsundere and tomboyish demeanor. Tsukasa often appears air-headed, clumsy, and dimwitted, leading to poor grades and comedic mishaps like destroying her cell phone in the laundry or failing to prepare instant noodles. She is also an extremely heavy sleeper who cannot wake up reliably, even with assistance. Despite these challenges, she excels in home economics and cooking, surpassing Kagami in household chores.

Physically petite, Tsukasa sports short lavender hair typically adorned with a yellow headband featuring a bow; its position subtly shifts to reflect her mood. Her distinctive droopy "tareme" eyes are indigo or blue-violet, lending her a perpetually nervous or emotional expression. Her school uniform consists of a loose white blouse with salmon-pink cuffs and collar, a light salmon-pink necktie, a matching short skirt, white calf-length socks, and brown loafers. Her resemblance to Akari Kamigishi from *To Heart* causes frequent mistaken cosplay identifications, especially in her autumn uniform – a recurring series gag.

Tsukasa's relationships highlight her dependence on Kagami for tasks like texting and academics, though their bond includes moments of intimacy like sharing cotton candy or Tsukasa napping on Kagami's lap. She uniquely calls Konata Izumi "Kona-chan" and occasionally shows jealousy over Konata's admiration of Miyuki Takara. Her non-confrontational nature makes her an easy target for Konata's pranks. While generally uninterested in anime and games, she enjoys the *Sgt. Frog* series.

Notable trivia includes her left-handedness, childhood dream of becoming a "bride," preference for the color white, and sharing her given name (Tsukasa) with the creator's pen name, Tsukasa Suina.