Height 144 cm (4' 9") Nationality Russian Affiliation Soviet Union Army (Idol Test Flight) Rank 2nd Lieutenant TSF Su-37UB Terminator, Su-47E Berkut A Surface Pilot in the Idol Test Unit. She prefers to hang around her co-pilot Cryska, whom she calls "sister", are the two are known and feared as the Scarlet Twins. Her innocent demeanor and young appearance belie her shocking aptitude as a pilot. She looks up to Cryska like an older sister, and is terribly afraid of being separated from her. Many of the things she says are mysterious. For some reason, she takes a special interest in Yuuya, befriending him. This is the catalyst for Yuuya and Cryska interacting, when they'd typically steer clear of each other. She carries around a teddy bear called "Misha".

Spoiler

Like Cryska, she is a psychic and a survivor of Alternative Plan III, and belongs to its sixth and last generation (hence the surname "Sestina" = "sixth"), with her "sister" belonging to a previous generation.