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 read morea 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.