Shochikubai Miroku (Akanishi Jin) is the son of a police commissioner (father) and also a traveller (mother). Miroku has lots of connections and is a very good fighter. His interest is his motorcycle.
Kikumasamune Seishiro (Yokoyuma Yu) is the rich son of a large hospital. He also fights as well as Miroku. He is a good fighter with smarts.
Bido Granmarie (Taguchi Junnosuke) is the son of a Swedish ambassador. He's also a playboy, dating many girls at once. Granmarie can't see himself going steady because he thinks the world can't handle it.
Kenbishi Yuri (Minami) is the rich daughter of a world-renowned president of the Kenbishi Business. She loves to indulge on eating. She's also a good fighter, but can never beat Seishiro.
Hakushika Noriko (Kashii Yu) is the daughter of a famous japanese painter (father) and her mother is from a tradition tea ceremony family. Her only hate is men and can get very violent when they touch her.
Kizakura Karen (Suzuki Emi) lives with her mother, a rich jewel dealer. Her dream is to marry into a rich family using her attractive body and style.
Together, they formed the Yukan Club, solving mysteries to pass time.