"Well then, how much will you pay to have me?" - Office worker Sumika has lived in perpetual mourning since losing Haruki, her first love who once lifted her out of the grief of losing her only family. A friend from work drags her out to a party, and there she meets Mr. Katsuragi, the vice president of the company hosting the party. It ought to be their first time meeting... and yet, he gives off the impression of already knowing Sumika very well. On top of that, just when Sumika is at her wits' end trying to think of a way to save the family that took her in, Mr. Katsuragi offers to buy her hand in marriage...? 「だったら、私をいくらで買ってくれますか？」――天涯孤独の悲しみから救ってくれた初恋の人・春樹を失った日から、毎日喪に服すように生きているOLの澄花。後輩に誘われ紛れ込んだパーティーで、主催する企業の副社長・葛城と出会う。彼とは初対面のはず…なのに、まるで澄花をよく知っているような素振りを見せる葛城。さらに、恩人を救うため途方に暮れていた澄花に、契約結婚を持ちかけてきて――？