In 2017 Yamasaki starred in a stage adaptation of the Akimi Yoshida manga Umimachi Diary. In 2018 a photo exhibition featuring  previously unpublished photos of Yamasaki was held at Tokyo Arts Gallery. Also in 2018 Yamasaki joined the cast of Hitokowa, a horror drama on the Hikari TV Channel.
In 2017, Yamasaki played a leading role in a stage adaptation of Umimachi Diary by Akimi Yoshida. The following year, an exhibition of previously unseen photos of Yamasaki was held at Tokyo Arts Gallery. Additionally, Yamasaki's acting career expanded with his involvement in the horror drama Hitokowa on Hikari TV Channel.