As oppose to the mythological creature Minotaur, a monsters of western culture, a Japanese monster Kudan has a human head and the body of cow. Kudan is born from female cow. It speaks human language, predicts significant incidents such as war or disaster and dies in three days. This story is about a man who is accidentally transformed into a Kudan. One day the man, who doesn’t communicate with his son well, receives a box by mail and he finds a strange helmet in the box. He is transformed into a Kudan when he wears it. Although his body stays in this world, his head is in another world, coming out from the cow’s body. The helmet is a door to another world…