Kitayama has also appeared in many television drama series such as Kazoku Gari (as Suzuki Keitoku) and in musicals such as Let's Sing A Song Of Love (celebrating 40 years of Kansai TV).

[6] Hiromitsu Kitayama attended Horikoshi High School and graduated from Asia University in 2008.

On 13 September 2023, a teaser video with the name "#TOBECONTINUED" was released on TOBE's official YouTube.

The new artist was to be revealed on the 17, but voices in X (formerly Twitter) were already guessing the identity of the new member to be Kitayama, who had recently left Johnny's.

[7] On 17 September 2023, Kitayama's identity was revealed, introducing him as TOBE's latest member.