Pierre operates Komorebi Pharmacy near Farma de Médicis's Parallel World Pharmacy, holding a Level 3 license from the Empire Pharmaceutist Guild. He has short brown hair and brown eyes, wearing a white lab coat at work and a green coat with a hat outdoors. Unlike his guild peers, Pierre shows no arrogance, deceit, or cunning. He readily accepts evidence of his own shortcomings, particularly after witnessing Farma's methods. Deeply devoted to his wife Leoni and daughter Marie, Pierre prioritizes their well-being, leading him to seek Farma's help when Marie falls gravely ill with fever, convulsions, and foaming at the mouth after his own treatments fail. Farma successfully treats Marie's influenza using precise weight-based dosages and advanced techniques unknown to commoner pharmacists, triggering an identity crisis for Pierre. He subsequently observes Farma's scientifically rigorous, patient-centered approach. At a guild meeting, Pierre publicly criticizes the guild's reliance on inaccurate treatments and profit motives, praising Farma's care for all patients regardless of status. Guild Master Veron, influenced by past trauma involving nobles refusing to treat his commoner son, rejects Pierre's arguments, expels him from the guild, and orders his pharmacy destroyed, ruining Pierre professionally and financially. Farma intervenes, offering Pierre training and a position in his new, royally authorized Compounding Pharmacy Guild. Pierre accepts, reopening his shop as the remodeled Dawn Pharmacy with access to Farma's effective medicines. Despite initial self-doubt comparing himself to Farma, Pierre attracts customers. He continues his pharmaceutical education while managing the shop, eventually rising to Master of the Dispensary Guild. During the Black Death outbreak, Pierre assists Farma's containment efforts, identifying infected samples from ships and distributing vaccines. Upholding Farma's principle of equitable treatment, he delivers the vaccine to his former guild leader Veron, challenging Veron's refusal by questioning the guild's failure to develop such cures. Veron personally rejects the vaccine and succumbs to the plague alongside other leaders, but his family accepts it. After the epidemic, former Empire Pharmaceutist Guild members seek admission to Farma's guild; Pierre explains apprenticeship requirements, supporting their genuine desire to abandon outdated practices for evidence-based medicine. Pierre maintains respect for Farma after his redemption. He attends a gratitude party hosted by Farma with his wife and daughter, symbolizing his integration into the new pharmaceutical community, his journey transforming him from a conventional practitioner into an advocate for accessible, science-based medicine under Farma's mentorship.