Kageyama (Sho Sakurai) works as the butler for rich heiress Reiko Hosho (Keiko Kitagawa). Reiko happens to be a novice detective but lacks certain deductive skills needed by detectives. Because of this Reiko relies on Kageyamaa to help her solve cases. Meanwhile, Kageyama isn't afraid to mince words and often calls out Reiko with his sharp tongue!

Keiko Kitagawa
as Reiko Hosho

Sho Sakurai
as Kageyama

Kippei Shiina
as Kyoichiro Kazamatsuri

Masatoshi Nakamura
as Takuya Todo (cabin manager)

Hitomi Miyauchi
as Rinko Todo

Jun Kaname
as Tenmei Ishikawa

Takeshi Kaga
as Shinnosuke Unabara (ship captain)

Tomoka Kurotani
as Chika Yuki

Masahiro Komoto
as Junichi Matsushige

Koji Ohkura
as Yuta Koenji