Taking an interest in acting as a teenager, Kamio decided to quit his high school soccer club and began his acting career.

[citation needed] In the same year in 2015, Kamio made his television debut in Mother, I'm Fine, a drama special for 24Hour Television: Love Saves the Earth.

He starred as Aran Maki, the 17-year-old prime minister of an experimental city, in Teen Regime, reuniting with Anna Yamada, whom he costarred with in What She Likes....[2][3] In May 2021, he made his first starring role in short film, "10 Years wondering in Shibuya - A Decade of Roaming" [4] Kamio announced he had left his agency on December 31, 2023.

[citation needed] Kamio was born on January 21, 1999, in Koiwa, Edogawa, Tokyo.

[5][6] He has been a soccer player since he was a child and originally dreamed of being an athlete.