Boundary of Humans and Youkai

A Spell Card of Yukari Yakumo from the world with a never-ending winter. In this attack, she makes her opponents realize that humans have entered the domain of youkai. During our world's Spring Snow Incident, Yukari informed Reimu of two things. First, the boundary between humans and youkai in Hakugyokurou had become less distinct. Second, Reimu, who had come to the Netherworld, had left the side of humanity. In Gensokyo, the humans and youkai maintain a relationship where they affect each other in important ways, and it is also taboo for a human to become a youkai.