I'm Sawa Kaizaki, the vice-captain of the newly reorganized GUTS-Select, and Operator of the Nursedessei. I am a dependable, older sister-like figure to the team's new members Kanata Asumi, Ichika Kirino, and Soma Ryumon, who in contrast to the mild-mannered Captain, commands them with stern words.

Although I am the pilot and operator of the Nursedessei, the team's mobile mothership and anti-monster battleship, I am a leading authority on monsters, holding a doctorate in biology.