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When a chain of messages from the King was received by the both of them, she was ordered by Nobuaki to call their other classmates to meet them at the park. During the middle of their conversation, she kissed Nobuaki, thus, obeying the order of the King. When asked by Nobuaki on what heavens look like, she told him that it doesn't matter since living is the best. At evening, Natsuko looked all over Nobuaki until she found him at the park, being anxious about the text message. When the first King's Game message "Nobuaki to kiss Natsuko before midnight" was sent to everyone in the class, Natsuko's friends thought it was Nobuaki trying to make his move on her. She even grows up to liking Nobuaki, despite the latter trying to shrug her and her other classmates off. When Nobuaki passed the baton to her, she surprisingly overtakes the current champion of the marathon, granting her class the winner of the game. She is known for being a cheerful girl who warms up transferees into her class and is famous for being the anchor of a marathon. Three months later after the events of Ousama Game: Rinjou, Natsuko transferred to Kure Academy hiding her dark personality to her classmates. As her and Chiemi were born during the time of the first King's Game, they became the hosts of the second King's Game and third King's Game. Thus, Natsuko became the winner of the second King's Game. Mai talked to Natsuko and somehow made her furious which caused Natsuko to push her off the railings and fell on her death, thereby completing her order. During this time, Natsuko received a second to last order from the King to kill Mai. During this time Natsuko was been in the hospital after being discovered unconscious near the end of the game, and received a text from the other survivor, Mai Satake, to meet her on the rooftop. However, as a result of the King's Game, Kentaro and all of Natsuko's other classmates were killed. Natsuko used to attend Shimon Academy, during which time she got into a relationship with Kentaro. Natsuko became hysterical for Kentaro's death. It was revealed in the third light novel that she is the twin sister of Chiemi. His hatred eventually reached a point to where he slapped baby Natsuko across the face, at which point it was decided that she would be sent away to live with her grandmother, meanwhile, Chiemi would continue to be raised by her parents. However, Kazunari began to feel loathing towards Natsuko as her appearance and name were constant reminders of the painful events he went through during his own King's Game. Natsuko was named by her father in honor of his first love and cousin, who died in the first ever King's Game. She is also said to be a fast runner and athletic (according to Rina) and this is demonstrated at the sports relay race and shown when she could climb and jump a wired fence with little effort.
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However, as a result of her previous experiences playing a King's Game in the past, she became twisted and dark, apparently willing to sacrifice others in order to ensure her survival and keeping her former personality only as a facade. She is cheerful and popular because of her outgoing nature. Natsuko used to be a very sweet person, usually being the first to introduce herself. She has blue eyes and wears the standard female uniform for Kure Academy, with thigh-high dark grey socks and black school shoes. She has violet-brown hair that is chest-length, and she has a small beige clip on the left side of her bangs.