I studied literature at Sōka Gakkai University when I was young. After graduation, I went to new york State University for an MBA. After returning home, my sister and I got married at Sōka Gakkai University.

In the early days, I worked in Alpine Electronics Company, then in the management department of Walter Disney Company, and was promoted to the president and president of Walter Disney Overseas Japanese Department.

During his tenure at Disney, Kenji Hoshino proposed to distribute the audio-visual products of Ghibli Animation Studio through Disney, so he had the opportunity to contact the relevant departments of Ghibli. Later, in 2008, Kono agreed to toshio suzuki's request and took over as the president of Ghibli. Kenji Hoshino, who became the president, also promised to operate "without interfering with Ghibli's existing creative environment".

In addition to holding management positions in animation-related industries, Kenji Hoshino also established the Hoshino Fund.

In September of 20 13, Yasuno Hoshino, then president of Studio Ghibli, announced at the Venice Film Festival that the famous director Miyazaki Hayao would no longer participate in the creation of long animated films, which caused numerous exclamations from filmmakers and fans.