Reincarnated in another world as a slave, Linus was raised as an elite "Barrier Master." Having married the First Princess Ricolette and the sheep-woman Meirius, Linus has been spending his days happily as an honorary marquess. After saving the Hideta Empire from a conspiracy, Linus thought he could at last take a breath. But then, he was appointed as a new lord! As he grows uneasy yet hopeful about his new world, one night, a strange, beautiful girl suddenly pays a visit to his house...?