After graduating from Tokyo University of Agriculture and Technology in 2014, Dr. Kaji worked at an animal hospital in Hyogo Prefecture from 2014 to 2019. In 2019, Dr. Kaji started working at the Night Emergency Medical Department of the Japan Small Animal Medical Center (currently the Night Emergency Medical Department). Since 2021, Dr. Kaji has been the head of the Night Emergency Medical Department. They specialize in cardiology and surgery and are actively involved in writing and lecturing activities.