Oura Ryuichi whose real name is Yasuhiro Kajiura, is an actor, singer and author living in Tokyo. In 2014 he played the Ultra Party Guardians commanding officer in an Ultraman superhero TV series, a role that made him famous.

He and ex-wife divorce when their son Sunowa was three. At first, the boy lived with his mother, but a traumatic incident during the Tohoku earthquake and tsunami disaster in 2011 proved the catalyst for the couple to change their son living arrangements. Oura remained in Tokyo to begin his journey as a single parent.