Two years after being suddenly transported to another world, Rin Tachibana, a romance-challenged woman in her thirties, has settled into a quiet life as a clerk for the Magic Knights. Her routine is shattered when the king and the Border Guard commander issue a secret order: she must perform a unique form of service for her colleague, the dazzling but arrogant magic swordsman Oscar Garland. Oscar is a notoriously misogynistic man whom Rin considers the most insufferable person she has ever met—she had hoped never to see him again. The service is presented as a life-saving medical treatment that requires intimate physical contact, and despite her fierce refusal, Rin is reluctantly convinced to comply. What begins as a purely clinical task soon grows complicated as Oscar's unexpectedly vulnerable reactions under her touch stir dormant feelings in Rin. She finds herself drawn into the secret arrangement, servicing him at night while maintaining a professional facade beside him during the day. The story follows the push and pull between the two as Rin navigates her growing thrill from their encounters and her lingering irritation with Oscar's personality. Oscar, meanwhile, despite his initial dislike of women, becomes increasingly enamored with Rin. Their hidden relationship evolves through tension, jealousy, and mutual discovery, centering on how a forced arrangement transforms into genuine emotional and physical intimacy. The narrative balances romantic development with the practical challenges of keeping their activities secret from the rest of the knight order.