Kagiya Shino is the daughter of the president of "Kajiya Foods", a long-established confectionery manufacturer and is currently working in the company under the PR department. Shino's father arranged a political marriage and has Shino engaged to Tachibana Hajime, an aces in the Sales department. Based on his looks, personality, qualifications, Tachibana seems to be a perfect fiancé, but three years have passed since their engagement, and Shino is still frustrated by the lack of progress beyond a kiss. One day, a new employee, Hanazawa Yui, is assigned to the Sales department, and Shino feels a stirring in her chest when she sees Tachibana interacting with Yui as her supervisor.
Takasaka Aoi lived happily with his wife, Mitsuki, and their son Ren. But one day, during a medical examination, he was told he had only three months to live. Encouraged by his beloved wife, Aoi decided to fight the disease. But when Aoi left, Mitsuki took out her smartphone and made a call. "Ken-chan. Aoi-kun is really going to die!" Mitsuki's true nature gradually becomes clear. With only three months to spare, Aoi must uncover Mitsuki's true identity in order to protect Ren!
