Nurse Atsuko Sawada is a minor character in the Japanese film Suicide Club, sometimes also known as Suicide Circle, where she appears briefly early in the story. She is a hospital nurse working a night shift with her colleague Nurse Yoko Kawaguchi. The film does not provide a personal background for her: she is presented simply as an ordinary hospital worker whose quiet night shift becomes part of the film's opening wave of unexplained deaths. She and Kawaguchi pass the time by listening to a radio and singing along to the pop group Dessert, which establishes her as an unremarkable, everyday figure before the horror of the story takes hold.

Her personality is shown through a few short scenes. She appears relaxed and conversational, and when the hospital's security guard, Jiro Suzuki, tells her about the mass suicide that took place that day at Shinjuku Station, she responds with disbelief rather than alarm, treating the news as something unlikely to be true. This reaction marks her as someone caught up in a situation she does not yet understand. In her final scene, after a power outage, she returns carrying food, asks whether Kawaguchi has left, and offers the other nurse's portion to Suzuki. She then opens a window and calmly steps out to her death. The calm and matter-of-fact manner of her actions, down to the everyday exchange about the food, is the most defining feature of her characterization.

The film does not give her an explicit personal motive for suicide. Her death is presented not as the result of individual despair but as part of the mysterious wave of self-destruction spreading across the country, and she is one of the first ordinary adults shown succumbing to it. Her role in the story is therefore to extend the suicide epidemic beyond the student victims of the opening scene and into an everyday setting such as a hospital. Her scene also introduces a recurring detail: a white, bloodstained bag left at the site of her death, an object that later becomes significant to the police investigation when similar bags are found to contain rolls of human skin.

Her key relationships are brief but meaningful. Her colleague Yoko Kawaguchi disappears earlier in the shift while fetching food, and her unexplained absence foreshadows what happens to Sawada herself, with the open window in the ward serving as the first sign of the fate that awaits them both. The other significant relationship is with the security guard Jiro Suzuki, who is the last person to see her alive; her courteous exchange with him immediately before her death is what makes her final act so striking.

As a minor figure with little screen time, she does not undergo any character development in the conventional sense. The film uses her to illustrate how quickly and quietly the suicide contagion claims ordinary citizens, and her arc is limited to the shift from an unremarkable nurse to one of the epidemic's early victims. In terms of notable abilities, she has none in a dramatic or supernatural sense; her significance lies in her ordinariness and in the composure with which she performs routine actions such as delivering food and exchanging small talk before stepping out of the window.