Yarennoka! was a mixed martial arts (MMA) event that took place on December 31, 2007 at the Saitama Super Arena in Tokyo, Japan. The event was promoted by the Yarennoka! Executive Committee, composed of former Pride Fighting Championships executives, and held in association with Fighting and Entertainment Group, DEEP, and M-1 Global. The event aired on HDNet and was billed as "Fedor Returns" in the United States; while it was shown on SKY Perfect, a Japanese pay per view network.

PRIDE Fighting Championships was a Japanese mixed martial arts promotion company. Its inaugural event was held at the Tokyo Dome on October 11, 1997. Pride held more than sixty mixed martial arts events, broadcast to about 40 countries worldwide. PRIDE was owned by the holding company Dream Stage Entertainment (DSE).