Nagisa Saito (born July 6, 2003) is a Japanese actress and former singer who rose to prominence as a core member of the idol group =LOVE (Equal Love), produced by Rino Sashihara, where she was frequently positioned as the group’s "center" and most recognizable face. After graduating from the group in early 2023 to pursue a professional acting career, she achieved a significant breakthrough with her acclaimed performance as Yua "Yua-tein" Takahashi in the live-action drama adaptation of Tomorrow, I'll Be Someone's Girlfriend (Asu, Watashi wa Dareka no Kanojo), a role that showcased her range in portraying complex, emotionally demanding characters. Her momentum continued into 2024 and 2025 with major roles in films such as the live-action Oshi no Ko, where she played the idol Mem-cho, and the romantic drama Ano Ko no Kodomo. Known for her distinct "doll-like" aesthetic and expressive acting style, she has also become a prominent figure in Japanese fashion, serving as a regular model for LARME and collaborating with high-profile beauty brands while establishing herself as one of the most successful "idol-to-actor" transitions of her generation.