Sae Niijima is a 27-year-old prosecutor working in the Tokyo District Special Investigation Department. She is known for her sharp mind, dedication to justice, and protective nature towards her younger sister, Makoto. Sae takes pride in her professional appearance and is often seen in a business suit. Despite her serious demeanor, she has a soft spot for children and enjoys spending time with her niece. Sae's life revolves around her career and family, and she believes in the importance of hard work and responsibility