Set in the future where it is commonplace for high tech crimes to get through cyber defense, Iwase Shobei, a wealthy man and well-known collector of gems, asks private investigator Akechi Kogoro to provide personal protection for his daughter Sanae. Iwase has been warned that she will be kidnapped. The mysterious phantom thief Kurotokage, who deftly replaces precious gems with imitations, stands in Akechi's way. However, Kogoro catches on that Madam Midorikawa, the owner of an exclusive hotel who has give shelter to Sanae, is actually Kurotokage, and prevents Sanae's abduction. However, he is hampered by a trick laid in the entire hotel and fails to catch her. At that moment, the thief and famous investigator secretly fall in love. Akechi chases Kurotokage and eventually learns about her tragic past and surprising identity. Although swayed by forbidden love, both have a final showdown at Kurotokage's secret museum which houses her collection. Who will be the victor?—Jdrama Weblog

Three stories are told, respectively set in Tokyo, Taipei, and Shanghai. The first two stories are about a Japanese person and a Taiwanese person. The last one is set in Shanghai with a story about a Japanese man and a Chinese woman. Some of the characters can speak Japanese and some of them Mandarin. Each story encompasses an experience of a foreigner, either from Japan, Taiwan or China, with a native of the opposite country.