20th Century (or in short, Tonisen) is made up of the 3 oldest members of the popular Japanese idol group V6. The members are Masayuki Sakamoto (坂本昌行), the oldest member and leader of the group, Hiroshi Nagano (長野博), and Yoshihiko Inohara (井ノ原快彦). The younger 3 members of the group form Coming Century or also known as, Kamisen. 20th Century is a sub unit under V6 and in Johnny's Entertainment. Just like V6 they're signed under avex trax.

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