Other ventures
Kamiki wrote his first book Master's Cafe: The Fulfillment of Masters' Dreams in 2015. He approached fifteen professionals who are active on the front lines of various fields. In 2019, he made his stage debut with the play Beautiful: The Woman Who Met with God, written and directed by Suzuki Matsuo. 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. He was also the official photographer for Satoh's 2021 calendar. In 2020, he started to conceptualize his annual calendar.
The 2021 calendar, one part of the 25th anniversary project, was started when "Novel characters I want Kamiki to play" video was posted on his Twitter, urging fans to suggest novel characters for him to portray. It garnered reactions from many celebrities, including voice actor Yuki Kaji and film director Shunji Iwai, among others. Finally, twelve novels were selected from the retweets to represent the themes for the twelve months. The lineup expanded from classics to more recent pieces. The calendar shot by the renowned photographer and film director Mika Ninagawa was a new attempt to play different roles for twelve works in the calendar. As Yonosuke in Ihara Saikaku's The Life of an Amorous Man for August, props such as smoke tubes are used in a colorful set to express the sex appeal of adults that has never been seen before by him, and the novel published in May cover, No Longer Human (as Ōba Yōzō), the darkness of human beings and the beauty of men are produced. 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. For this project, Kamiki sported silver hair for the first time, with shooting taking two days to complete. The calendar was sold on 25 December 2020, to signify the 25 year anniversary.
Kamiki was invited to be the photographer for Takeru Satoh's 2021 Calendar. 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. He took over eight thousand photos. Some are excluded in the desk calendar. He wants to have a photo exhibition and albums.
In 2022, Kamiki excavated one of the world's oldest ichthyosaur fossils in Minamisanriku in his first fossil excavation during the filming of From Miyagi. The fossil is on display at the Minasan Museum.
