"I'll pay your debts. But from now on, you're my pet." Michiko Fukagawa grew up in an orphanage believing that "Love starts with trust.” Due to her honesty and kindness, she agreed to be the guarantor of her boss. Unfortunately, he ran away and now she's stuck with his debts. When the collectors came, the intimidating yakuza Ishiori Yamazaki fended them off. But in exchange she's taken to his grand estate to live with him. Opposites attract between a fearsome yakuza and an innocent (and oblivious) girl living under the same roof!