Mina Misasa, a 14-year-old social media influencer dubbed a "Space Tuber," relentlessly pursues her goal of reaching 100 million followers by live-streaming space-themed content. Disliking space environments yet craving fame, she joins the Deegle Corporation’s promotional campaign, securing a spot for underage participants to visit the Anshin space station. Her pink heart-shaped drone, Selfie, films every moment, broadcasting real-time updates until a connection failure triggers panic, exposing her reliance on social validation.

Her younger brother, Hiroshi Tanegashima—bearing a different surname due to their parents’ divorce—accompanies her but contrasts her ambitions, genuinely admiring space and idolizing Touya Sagami, a station resident. When a comet collides with Anshin, Mina prioritizes her livestream despite mortal danger, inadvertently documenting survival efforts, rogue AI encounters, and the comet’s diversion. The footage spreads globally, catapulting her to unprecedented fame, wealth, and commercial deals.

Though moments of collaboration during the crisis suggest fleeting selflessness, her focus on social media dominance persists. Post-disaster, she flaunts private jets and helicopters, embodying a duality of calculated opportunism and accidental heroism rooted in her unyielding documentation.

Her identity as a content creator fuels clashes with others’ priorities, yet her compulsive recording etches her as the group’s inadvertent chronicler, shaping public understanding of the event. Details of her pre-Anshin life remain undisclosed, anchoring her narrative to the crisis and its aftermath.