Minami Chisato is a homeless girl living in internet cafes, burdened by her late father's massive gambling debts and constantly pursued by debt collectors. Her life takes an unexpected turn when she meets the eccentric president of a major toy company, Okura Shinzo, who offers to pay off her debts if she agrees to marry him. Shortly after their marriage, Shinzo passes away, leaving behind a bizarre will that requires Chisato to live with his six adopted, estranged sons in a massive mansion called 'Trick Heart Castle'. To inherit the company and secure her freedom from debt, Chisato must successfully act as a mother figure to these six unique and problematic men, each with their own deep-seated emotional baggage and secrets. As she navigates the complexities of her new 'family,' she must resolve their internal conflicts and prove that she can hold the household together, all while uncovering the truth behind Shinzo's intentions and the mysterious nature of the Okura family legacy.