- The mission of Kitashinagawa Lucky Detective Agency this time is to unmask Kurihara Mizuki (Ishihara Satomi), the secretary of the genius economist, Professor Amano Koichi (Oikawa Mitsuhiro) who takes part in Amano's management classes. Men involved with her are led down the path of destruction. Wakunaga Ryuzo (Hirata Mitsuru), the father of the agency's client, Wakunaga Katsu (Nakamaru Yuichi), is one such person. He ran a long-established traditional Japanese confectionery shop but lost everything and has gone missing. In order to get close to Mizuki, Tokita Shuntaro (Matsumoto Jun) poses as a young, successful businessman and the second generation owner of a restaurant.
Getting into the role of a celebrity, he attends a management class and approaches her. Shuntaro's strategy is a brilliant success. In front of Shuntaro, Mizuki gives him good-natures, feminine smiles. Shuntaro even forgets his mission because he is mesmerized by her. The two of them fall in love. However, that is just the start of Mizuki's trap...