A few months into his high school life, Renya Nijou has neither friends nor a girlfriend and spends his days living alone. But one day, he witnesses a group of mysterious men dressed in black attempting to kidnap Maya Kamishiro, the most beautiful girl in his class. Apparently, Maya's parents sold her off to pay their debts, so Renya decides to help her with the financial resources he obtained through investments. Maya can't help but want to return the favor, and declares that she will become Renya's maid...?