Tsukina Mizumori, a solitary woman in her thirties engrossed in reading and cooking, leads a quiet life until an orb claiming divinity summons her to be a savior for a different realm. Reluctant to embark on another adventure, Tsukina reluctantly complies, lured by the perks bestowed upon her by the enigmatic entity. Equipped with a mystical pendant, she establishes a book cafe at the town's edge where she encounters Il Soeil, a knight captain and avid reader. As their bond strengthens amidst the chaos caused by a prince-focused savior, Tsukina finds solace in her new role and the blossoming friendship with Il. Enjoying anonymity and tranquility, Tsukina's idyllic routine is disrupted when God cautions her about the other savior, threatening to unveil her hidden identity and jeopardize her peaceful existence.