Subaru Natsuki was an average NEET living in modern Japan when he suddenly found himself transported to a fantasy world. Initially confused and terrified, he soon discovers that he has acquired a unique ability called 'Return by Death.' This power allows him to return to a safe point whenever he dies, experiencing each death painfully while gaining knowledge of what will come next. As he navigates this new world, Subaru encounters numerous challenges, forming deep connections with various characters, especially Emilia, whom he vows to protect at all costs. Throughout his journey, Subaru faces moral dilemmas, personal growth, and the heavy burden of his powers, leading him to become a central figure in the battle against powerful foes, political intrigue, and the quests for love and redemption.