Sei Takanashi, a Japanese office worker in her twenties, finds herself summoned to the kingdom of Salutania through a botched ritual meant to summon one Saint—a mishap that pulls her in alongside Aira Misono. Dismissed upon arrival due to her exhausted demeanor, a remnant of relentless overwork in her corporate life, she hides her identity to carve out an autonomous existence. Over time, restorative self-care practices and newfound respite erase her dark circles, sharpen her vision, and unveil a striking natural beauty. Her latent saintly powers amplify the potency of any healing or restorative item she crafts—potions, cosmetics, meals—by fifty percent. Her magic, radiant gold energy, purges miasma, regenerates lost limbs, and rejuvenates blighted landscapes. Classified as "infinite" in Salutania’s magic hierarchy, her abilities surge through "Saint’s Conjuring," triggered by intense emotional resonance, particularly compassion or affection for others. Assigned to the Medicinal Flora Research Institute, she revolutionizes local practices by blending modern herbal knowledge with Salutanian traditions, inadvertently exposing her sainthood. A high-grade healing potion she brews saves Knight Commander Albert Hawke’s life, sparking scrutiny. Though Crown Prince Kyle initially resists her legitimacy, favoring Aira, Sei’s feats—cleansing miasma-ridden swamps, mending soldiers, revitalizing ecosystems—win public acclaim and cement her role as the true Saint. Pragmatic and composed, she navigates crises with methodical calm, deflecting praise to evade scrutiny. Yet beneath this poise simmers quiet vulnerability, especially around Albert, whose steadfast partnership evolves into a guarded romance culminating in engagement. Their bond strengthens through shared trials, with Albert shielding her during perilous missions. Capitalizing on modern skincare expertise, she launches a cosmetics line—eye-bag creams, acne solutions—that becomes a capital sensation. Her culinary experiments yield dishes that temporarily boost physical prowess, merging practicality with innovation. Haunted by her past as a corporate drudge, she resists burdensome obligations yet adapts to her saintly duties, balancing court politics, advanced healing studies, and friendships with allies like researcher Elizabeth Ashley. From reluctant outsider to Salutania’s linchpin, her journey weaves self-preservation with quiet heroism, reshaping a realm’s fate through resilience and reinvented purpose.