Ніїджіма Сае

Sae is the older sister and legal guardian of Makoto Niijima since their father's murder a few years ago. Sae works as a Public Prosecutor of the Tokyo District Special Investigation Department at the Public Prosecutors Office.

Sae is intelligent, professional and serious, although her actual maturity is debatable. A workaholic, Sae is very strict in both her work as prosecutor and guardian for her younger sister, Makoto, constantly telling her to focus on her studies and such. With many responsibilities, Sae is always working due to Japan's work pressure, and is very stressed and exhausted. She must care for Makoto, almost putting her in a single mother's role. Her father's ideals, who died in the line of duty, is her sore spot.

She resents him for throwing his life away in the name of justice, to the point that when Makoto asks for her opinion on whether he would think the Phantom Thieves of Hearts were just, Sae snaps and says a bunch of cruel things that she instantly regrets, up to and including that she views Makoto as a burden.

(Source: Megami Tensei Wiki)