Hideki Shiraha (January 5, 1943 – March 26, 2021) professionally known as Tadashi Sawamura was a Japanese karateka and kickboxer.
Sawamura’s life inspired the manga series Kick no Oni, written by Ikki Kajiwara and illustrated by Kentaro Nakajo, the manga was published in 1969 in Shōnen Gaho magazine, which was adapted into an anime series from 1970 to 1971 by Toe Animation. In 1971, Sawamura appears in an episode of The Reurn of Ultraman, where he trains Hideki Goh.