After entering high school, Rikuto, the future head of the Ayamejou-Kouji family, begins living alone in a penthouse apartment at the top of a luxury tower. However, his new life takes an unexpected turn when Kanna, a maid with a knack for eccentric behavior and conversations, arrives. With every action and word of Kanna's being packed with weirdness, Rikuto can't stop reacting and retorting. He's torn, does he want her to act normal, or stay just the way she is?