Everything here happens in Gensokyo — an eastern land that is sealed away from the world outside. Gensokyo contains youkai — Japanese mythological creatures who, with the passage of time, started to appear in forms close to humans, mostly females. Youkai live here due to the high technological advances of the outside world, leading humans to lose their faith in youkai. you happens to be underground, only they know for what reason. Yamame just meets you here, just in her domain...