Trivia

He modeled for Issei Miyake, Keita Maruyama and CK.

Has be in two "Shin" films: Godzilla Resurge (2016) and the upcoming Shin Ultraman (2022).

Together with Director and Editor, Ryo Takebayashi, Takumi produced and planned "The Big House". According to Saitoh, «this film aims to be a "subject-first" and non-commercial screening, and we need the support of those who resonate with our work». According to its official website, this project aims to provide «social care and protection of children who do not have a guardian [,] or for whom it is not appropriate to have a guardian in their custody, as well as providing support to families who have great difficulties in raising children».

While still attending high school, Saitoh signed a modeling contract with Indigo at age 15.

Won the Best Director Award at the Shanghai International Film Festival, for "Blank 13" (2018).

Walked the runway in Paris, on his third year of high school, and made his acting debut when he was 20.

Saitoh's father worked in the film industry and he would often visit him at work as a child, which he later cited as his inspiration to become an actor.