[3] After graduating from vocational school, he joined the anime industry in 2002 as a production manager and assistant director for Vega Entertainment on their adaptation of Leiji Matsumoto's Gun Frontier manga series.
[3] In 2008, he debuted as a chief unit director with (Zoku) Sayonara, Zetsubou-Sensei alongside Shinbo.
[7] Miyamoto brought on Gekidan Inu Curry, who were classmates of his and whom one of its members (Doroinu) was a close friend of his, to do one of the opening animations for the third season.
[18] Yoyogi Animation Academy invited him to give a special lecture to students in collaboration with The Quintessential Quintuplets~ in August of 2024.
[19] Miyamoto described himself as being a "heretic" at Shaft—someone who, in a company of many differing directors, is only good at doing "plain work", and isn't particularly original or creative.
[20] Shinbo described Miyamoto in a similar way, but said that he was more like a professional craftsman who leaves their mark in places that cannot be seen.