Preheat oven to broil. In a large bowl, combine imitation crab meat, kewpie mayo, sour cream, and sriracha. Mix thoroughly.
In a large casserole dish, lightly press rice into an even layer. Liberally sprinkle furikake across the top of the rice layer. Evenly spread the crab mixture on top of furikake layer. Sprinkle more furikake on crab mixture.
Broil for approximately 5 minutes or until the top is lightly browned. Scoop and place a slice of sushi bake on a sheet of nori, wrap and enjoy.