Wanting to become the main protagonist of the franchise again, Iyami holds a bizarre kart race to determine who the protagonist of Osomatsu-san will be. The race quickly turns into a bloodbath as the contestants start killing each other off in order to be the last one standing. After Iyami sets off a death ray that kills off almost everyone on the planet, it comes down to a final showdown between Osomatsu and Iyami, but they both fall short of the finish line, leading to an unexpected winner.