In Hokkaido,Japan, lies Shiretoko. It's a natural World Heritage Site where the Hokkaido sika deer thrives. In the fall, 150-kilogram stags engage in fierce battles. They clash with each other using their enormous, 70-centimeter long antlers. Only the victors get to mate. Every spring males lose their antlers, their main means of attack and defense. Until new ones grow back, they do their best to survive, just grazing away. Females give birth in early summer. They raise their young taking full advantage of the forest's resources. This program, shot over a period of 1 year, delves into the lives of Hokkaido sika deer living on the Shiretoko peninsula.