Starting his career as a child prodigy, he has garnered critical acclaim and numerous awards for his performances across 25 years in the industry.

His early film roles include Spirited Away (2001), Bayside Shakedown 2 (2003), Howl's Moving Castle (2004), Doraemon: Nobita's Dinosaur 2006 (2006) and Big Man Japan (2007).

He had his first leading roles in Takashi Miike's The Great Yokai War (2005) and Daihachi Yoshida's The Kirishima Thing (2012) and played supporting characters in Keishi Ōtomo's jidaigeki actioners Rurouni Kenshin: Kyoto Inferno and Rurouni Kenshin: The Legend Ends as well as Miike's horror film As the Gods Will (all 2014).

Kamiki later co-starred with Minami Hamabe in two productions released in 2023: the TV drama series Ranman and Takashi Yamazaki's Godzilla Minus One.

[14] In 2019, he made his stage debut with the play Beautiful: The Woman Who Met with God, written and directed by Suzuki Matsuo.

[15][16] The following year, he debuted in multiple fields such as a radio host for All Night Nippon 0 (ANN0), directing the music video for "I Treasure You" and opened his official YouTube channel.

It garnered reactions from many celebrities, including voice actor Yuki Kaji and film director Shunji Iwai, among others.

Of the twelve novels so far, Mysterious Weather at Yanaka's Retro Camera Store (as Imamiya Ryūichi) and Hamlet (as Ophelia), including the prior mentioned works have been confirmed.

The concept of a "photobook-like calendar" featured natural expressions when spending time with friends—with a sense of distance that can be taken by an old friend.

It is a special calendar taken in places where Satoh wants to go with Kamiki and where he would like to take pictures of him, such as driving the car, in Shibuya and Harajuku, in maid cafes, etc.