Saneatsu Narita, a 15-year-old student in Suginami Second High School’s Class 1A, lives independently after his mother’s early death in a car accident, sustained by monthly stipends from his absent father—an overseas management consultant. Academically and athletically adept yet inept with technology, peers Ryuta Ichinose and Kazuhiko Satō mockingly dub him “Useless-Atsu with computers.”

When mass disappearances trigger chaos, he rises as a tactical leader, unraveling betrayals within allies and dismantling the antagonists’ “privilege” system under Sōtarō Shinozaki’s mentorship. His defiance peaks in a sacrificial clash with the Emperor, though “stop rights” mechanics resurrect him, thrusting him back into escalating conflicts.

Resurrected, he commands the Anti-Emperor Front (AEF) in the third arc, orchestrating coordinated strikes against emerging threats. His strategic brilliance cements him as the resistance’s cornerstone, while his solitary upbringing and grief silently fuel his resolve.

Amid comedic exchanges, he anchors the group as the pragmatic “straight man,” tempering tensions with levelheadedness. His journey shifts from survivalist instincts to burdened leadership, adapting under relentless psychological strain.

Physically unassuming at 170 cm and 61.5 kg, his blood type A and Virgo pragmatism contrast subtly with multicolored hair, while his attire remains conventionally understated, blending into school corridors.