Prior to debuting with Tokio, Joshima was a backup-dancer for various Johnny's Entertainment boy bands at the time.[3] He also formed temporary music units during that time, such as the Joshima Band with other to-be Tokio members. In 1990 he became the leader and guitarist of Tokio, but it wasn't until 1994 that the band debuted.[3]
As an actor
Joshima has had parts in various dramas since 1989. One of his first roles ever was as a supporting cast member in the show Gomendou Kakemasu, where he acted alongside Kazuya Takahashi of Otokogumi and Naoto Endou of former Johnny's band Ninja.[4] He has also hosted Ai no Apron and Leader's How-To Book, Brain Power Expedition Quiz! Homunculus with fellow member Taichi Kokubun, and with other Tokio members, hosted Gachinko!, The Tetsuwan Dash, Mentore G, and 5LDK.[2]
