 On August 6, 2005, Kaji, along with Hiroki Suzuki, appeared on the radio program, Marvelous Radio Vibration that was hosted by fellow D-Boys members Yuu Shirota and Kotaro Yanagi.The D-BOYS so far have released two Photobooks.The first photobook released on April 27, 2005, was self-titled "D-Boys", while the second, released on March 15, 2006, was called "Start", both which contain many photos of Kaji.