Hironori Koshoji was born on 7 May 1963 in Miyazaki. In 1979, when he was sixteen years old, he injured his cervical vertebrae in an accident during a physical education lesson, leaving him paralyzed from the shoulders down. At the advice of his therapist, he made his first attempts at mouth painting which was the start of a new passion. Two years after his accident he received a scholarship from the Association and with it the opportunity to dedicate himself intensively to painting. In the year 2000, he was awarded the status of an Associate Member of the AMFPA.
In the beginning, Hironori Koshoji concentrated on caricatures, painted with a pencil. Later on, he became interested in other painting techniques such as oil and watercolour and regularly took lessons with an academic painter. At the moment he is studying representational painting, especially fairy tale portrayals. In the course of the years, he has taken part in several successful exhibitions in Japan.