Saki Morimi, born January 6, 1989, is a Japanese university graduate first encountered at age 21 during her graduation trip to Washington D.C. Orphaned and financially reliant on her older sister Asako, brother-in-law Ryousuke Morimi, and their infant child for her education, this dependence fueled deep shame. She planned to join Ryousuke's company while hiding an unrequited attraction to him, complicating household dynamics. In D.C., she discovered a naked, amnesiac Japanese man—later identified as Akira Takizawa—outside the White House. After lending him her coat during a police incident, she realized her passport was left inside and pursued him, ultimately deciding to return with him to Tokyo. This choice entangled her in his investigation of the "Seleção," a high-stakes game where twelve players wield immense resources to "save" Japan. Her keen observation and empathy proved vital, helping decipher clues and navigate intricate social tensions surrounding Takizawa’s mission. She rejoined her friends' startup, "Eden of the East," creators of an image-recognition app. This connection provided Takizawa critical access to their technology, instrumental in stopping missile attacks. Romantic feelings blossomed between them during these events, becoming mutual. After Takizawa erased his memories and vanished post-crisis, she spearheaded a six-month search. Guided by clues from his prerecorded message on a "Seleção phone," she traveled to New York City. There, she confronted a weapon smuggled into her luggage and a taxi driver who fled with the phone. Overcoming these dangers, she located Takizawa—now operating under the alias "Akira Iinuma" and devoid of memories of their relationship. They retrieved the phone together and countered emerging threats from rival Seleção players. Her involvement intensified as she aided Takizawa's quest to find his biological mother, seeking answers about his alleged link to the late Prime Minister Iinuma. This journey led them to symbolic sites like a carousel where his mother left a ring. She showed increased initiative, coordinating with Eden to identify Takizawa’s childhood pet and trace his mother’s whereabouts. In the final confrontations, she helped evade adversaries—including Seleção Daiju Mononobe—and supported Takizawa’s public address to Japan. Following the Seleção game's resolution, she reaffirmed her commitment to him at an airport, marking her evolution from passive observer to resilient, active partner in his life and Japan's challenges. Physically, she stands approximately 154–162 cm tall with orange hair and brown eyes. Her attire is practical yet distinctive: a red coat, pink sweater, light brown skirt, blue jeans, and brown boots. Her personality blends attentiveness, analytical skill, and emotional sensitivity, shifting from initial uncertainty to determined agency through these events.