Chie Negishi functions as the narrative's deuteragonist. Engaged to Hirofumi Satake, a central figure convicted of her alleged murder, she possesses shoulder-length brown hair and striking golden eyes.

Her background highlights a passion for global backpacking. Throughout her relationship with Satake, she consistently supports him during his persistent misfortunes and survival of extreme events. Despite Satake's conviction for her murder, she later resurfaces alive alongside Joji Kito. This reappearance casts doubt on the conviction's accuracy and hints at a larger conspiracy.

A significant episode portrays her experience as a stalking victim during her travels. She is obsessively pursued across multiple countries by an individual named Jack, leading to a dangerous confrontation that underscores her vulnerability and the real-world issue of digital stalking. This narrative segment incorporates a public service announcement advising caution with social media: limiting post visibility, avoiding location or routine disclosures, and scrubbing personal details from uploads to prevent tracking.

Her survival and reappearance directly contradict the initial premise of her death, positioning her as a pivotal figure in uncovering broader hidden truths surrounding Satake's experiences and the activities of the research institution studying him.