Sabato Mihashigo, alias Sabato-chan, is a fallen angel tasked by the celestial organization Rurutie to assassinate Sakura Kusakabe—a mission critical to thwarting his future development of technology that freezes female aging at twelve, a innovation Rurutie fears could catalyze societal exploitation. Acting under orders from her mother, Babel Mihashigo, Rurutie’s chairman, Sabato cannot return home until she eliminates Sakura. Though positioned as an antagonist, she shares an uneasy coexistence with Dokuro Mitsukai, her rival, balancing sporadic camaraderie against their clashes over Sakura’s destiny.

Sabato employs calculated deception, masquerading as innocent or coquettish to lure Sakura into traps before striking with Durandal, her shock baton capable of vaporizing massive targets in seconds. Her demeanor blends exaggerated politeness—frequent use of "-san" honorifics—with thinly veiled menace, oscillating between cordiality and threats. Repeated mission failures have relegated her to a crumbling bridge-side shack, mysteriously financed, symbolizing her precarious standing within Rurutie.

Visually, Sabato sports blonde hair, curling ram horns, and a hovering halo, clad in Gothic Lolita attire in manga renditions. Her speech in Japanese media concludes with "desu," accentuating a ditzy affect that belies her lethal agenda. Despite her comedic role as a persistent assassin foiled by Dokuro or her own rashness, subtle acts—like accepting clandestine meals from Sakura—hint at moral complexity beneath her ruthless objectives.

Consistently portrayed across official media, including the second OVA season, Sabato remains static: a recurring comedic obstacle trapped in futile assassination loops, her narrative unchanging, with no spin-offs or evolution documented. Her function endures as a chaotic counterpoint within the series’ absurdist tone.