Gensokyo, the Land of Illusions and Fantasy. Many years ago, this world of magic was established and sealed away from the world of science by the Hakurei Border, as a last effort to cease the constant wars between humans and youkai, by locking away these supernatural beings from the human world. Reimu Hakurei, through her lineage of humans trained in the magical arts, inherited the duty to guard and maintain the border, with assistance from the youkai Manipulator of Boundaries, Yukari Yakumo.
Many humans throughout time have heard stories of various types of youkai, ranging from vampires to demigods. Before the Hakurei Border's existence, they roamed the earth as freely as humans. Ghosts like the powerful magician, known only as Mima, haunted homes, towns, and fields, attacking humans unfortunate enough to cross paths with her. Vampires like the refined Remilia Scarlet and her sister, the mighty yet unstable Flandre Scarlet, resided in mansions that humans soon learned to fear. Manipul