[citation needed] Katsuya was born as the youngest brother.
[2] He learned football when he was in elementary school.
[2] When he moved to Tokyo at the age of 22 Katsuya had a part-time job as a construction assistant.
[2] He said that his great-grandfather came from the Netherlands who came to Japan to sell jewelry during the Meiji period.
[3] On 27 September 2024, he announced through his agency that he married with a former Takarazuka Revue actress Suzuho Makaze.