There is a secret organization in this world that chooses to "eliminate" the evils of this world that cannot be punished by law as malignant tumors and bury them in the darkness. Its name is "Black Label". As a member of the organization, 17-year-old high school student Mikami Arashi stands up to the huge evil. This story is a record of the struggle between the choice and consciousness of a high school student who serves as an executioner.