Sae Niijima from Persona 5. She plays a very important role in the series. The events we see in the game/anime are all flashbacks from the protagonist as he tells her his story. Sae is a prosecutor, and older sister of Phantom Thief member Queen. Throughout the time Protag knows her when having these flashbacks, she understands the world he's seen over the few hours they spends discussing the events that occurred.