In his childhood, Tsuchie Takeshi cherished memories of playing with the gentle Hikari-chan. But one fateful day, he is kidnapped and brought to a grand mansion, where he discovers that she has transformed into a haughty and aggressive dominatrix. To his surprise, she claims he vowed to marry her! Now, Takeshi must navigate this unexpected reality, adapting to her altered demeanor and his role as the newest member of her elite household.