Tegoshi appeared with his band members on Johnny's related television shows, such as Shounen Club and Ya-Ya-yah, soon after he entered the entertainment business.
[3] At the end of 2008, director Hans Canosa cast Tegoshi as Mirai for the movie Memoirs of a Teenage Amnesiac, based on the novel of the same name by Gabrielle Zevin.
[5][6] In 2009, Tegoshi took part in the musical comedy Dream Boys 2009 alongside fellow Johnny & Associates members Kazuya Kamenashi and Subaru Shibutani at the Imperial Garden Theater in Marunouchi, Tokyo.
Not only did Tegoshi appear in the stage play, he also acted in a special drama for FujiTV titled Dareka ga Uso wo Tsuiteiru.
[7][8] Tegoshi also participated on the running-themed variety show called Sōkon[9] with fellow NEWS members, Keiichiro Koyama, Shigeaki Kato and Takahisa Masuda.
[10] At the end of 2009, it was announced that Tegoshi would take on the role of Toyama Yukinojo in the live-action drama adaption Yamato Nadeshiko Shichi Henge based on the manga of the same name.
[15] Following his departure, Tegoshi held a press conference claiming that he left the company on good terms and that the tabloids had falsely reported a charity meeting as a drinking party.
He announced plans to continue solo career activities including singing and that he had already intended to leave NEWS at the end of their Story concert tour.
[18] Tegoshi made his solo artist debut on July 7, 2021 with his first digital single "Cinnamon" and from there released songs for six consecutive months until December 2021.