I apologize, but after thoroughly searching the available information, I cannot find any character named Kenji in the film Sadako vs. Kayako. The main cast includes characters such as Yuri Kurahashi, Suzuka Takagi, Natsumi Ueno, Professor Shinichi Morishige, the exorcist Keizo Tokiwa, and the psychic girl Tamao. A character named Keizo appears as a significant figure, but there is no reference to a Kenji. It is possible the name was confused with a different character from another film in the Ring or Ju-On series. Since no reliable direct information exists about a character named Kenji in this specific movie, I must respond with no info.