Saori's a bright, hard-working girl whose life is about to take a turn for the better. With her mother remarrying, Saori is going to get a new dad! This exciting prospect is ruined when a handsome stranger with awful manners informs her that her mother is dating a married man - and that very man is his father.

Adding to Saori's shock, the gorgeous but cruel Takahito demands money for moral losses. There's no way Saori can come up with the sum he suggests, but Takahito then makes another proposal: Saori is to be his to command for a week... body and soul! Although he's seemingly heartless, his gentle caresses light a fire in her heart...