The story begins when a high school student named Yachi Haruaki receives a mysterious, super-heavy blue cube from his archaeologist father overseas. There proves to be more to the cube than what meets the eye when that night, Haruaki wakes up to a suspicious noise in the kitchen, and discovers a fully naked female rice cracker thief. The girl introduces herself as Fear, a Cursed Tool, or Wathe, born from negative human emotions meant to maim and kill, and enlists his help in removing the curse placed upon her to torture others...