Goseki Koichi (五関晃一) is a Japanese idol, a member of A.B.C-Z, a former member of B.B.A., a former member of Secret Agent, and a former member of B.A.D..

He joined B.B.A. in 1998 and left in 2001 where they ceased activities.

He left Secret Agent in 2000 where they ceased activities.

He joined B.A.D. in 2001 and left later the same year.

He joined A.B.C-Z in 2002.

Discography Featured In

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