Legend has it that demons have been lurking in the human world since ancient times. Humans are completely helpless against demons, so they seek help from demon hunters. Demon hunters are slender women with silver eyes carrying huge swords. They have demon blood mixed in their bodies and can be considered half human and half demon. Because they carry huge swords, people call them Great Swords. The story of this game is an adventure story about the encounter and acquaintance between Claire, a member of the Great Sword, and the human boy Laki, as well as other members of the Great Sword.