He has acted in several movies and television shows as well as being a co-star for Tokio's variety shows
Tokio Kakeru and
The Tetsuwan Dash. On 25 April 2018, news broke that Yamaguchi had been referred to prosecutors for allegedly kissing a girl against her will at his home in
Minato, Tokyo, in February 2018. At a hastily arranged news conference at a hotel in Tokyo on 26 April, Yamaguchi apologized for kissing and engaging in indecent behavior with a high school-aged girl. A lawyer representing Johnny & Associates, the talent agency that manages Tokio, announced that Yamaguchi would be indefinitely suspended from activities. On 6 May 2018, Johnny & Associates announced that they had terminated their contract with Yamaguchi. ==Personal life==