Pucelle Reinzette is a young warrior of La Pucelle, a religious order dedicated to eradicating demonic threats. Rigorous training within this organization forged her into a primary combatant against supernatural forces. She consistently bears heavy responsibilities on missions, frequently confronting the most dangerous entities with minimal backup.

Her path is profoundly shaped by two key figures: her younger brother Culotte and fellow warrior Alouette. Culotte relentlessly mocks her aspirations and dismisses her concerns despite her protective efforts. His impulsive ventures into monster-infested zones force her into repeated rescues, compounding her burdens. Alouette exhibits unwavering disdain, treating her as inferior and manipulating group dynamics to serve external agendas. This includes orchestrating the crucifixion of an innocent pregnant woman—a follower of their own faith—knowing it would trigger a comrade's descent into madness and unleash mass casualties across a continent.

These corrosive relationships wear down her emotional armor. She internalizes immense stress while striving to project strength, receiving scant emotional support beyond occasional encouragement from the comrade Croix. The relentless pressure of Culotte's recklessness combined with Alouette's calculated cruelty pushes her toward psychological unraveling, culminating in her embrace of destruction.