Erika Toda joins a law firm headed by Serizawa-san, on the first case she meets Enomoto Kei of Tokyo total security who unlocks Serizawa who has accidentally been trapped in a vault. Form thereon the trio solve 10 cases related to the locked room. Enomoto always makes a small scale model and thinks technically in terms of security and locks to solve cases, while Serizawa assists by hinting some circumstantial evidences. Serizawa is always ready to take credit of new found fame.
as Kei Enomoto
as Junko Aoto
as Gou Serizawa
as Mitsuo Kouno
as Toru Inaba
as Ikuko Okamura
as Tetsuji Hiramatsu
as Susumu Kohiyama
as Shouzou Fujibayashi
as Sasaki
as Haruka Kiryuu
as Tachikawa
