Harashima is a Japanese professional wrestler. He is best known for his work in DDT Pro-Wrestling, where he is a ten-time KO-D Openweight Champion and a current eleven-time KO-D Tag Team Champion.

DDT Pro-Wrestling is a Japanese professional wrestling promotion based in Shinjuku, Tokyo. Its name stands for Dramatic Dream Team, which was the promotion's official name from 1997 to 2004. Founded in March 1997 by Shintaro Muto, the promotion was eventually bought and managed by Shoichi Ichimiya until December 2005, when Sanshiro Takagi took over as the new president. In 2017, DDT was sold to CyberAgent. Takagi retained his position, while Takahiro Yamauchi took over as the new DDT director.