The story tells of Aya Mizuki, a first-year student at a public high school, who has to work every day to support his family because of his parents' lazy nature. On Christmas Eve, when Ayasaki returned home, he found a note from his parents. It turned out that after they had accumulated a debt of 150 million yen, they fled. In order to pay off the debt, they even attempted to sell Ayasaki's organs. With no way out and being chased by the yakuza, Ayasaki planned to kidnap a girl in the nearby park for ransom. Rushing over, he said to the girl, "I... need you (as a hostage, although these last three words were not yet spoken)." Through a series of misunderstandings and twists of fate, Ayasaki ended up becoming the girl's savior instead. As it turns out, this girl is the heiress of the Sanzenin financial empire. To repay her debt of gratitude, she hired Ayasaki as her butler and paid off his debts. However, the good-hearted Ayasaki insisted on repaying this money, and thus, Ayasaki's life as a butler began...