Markus-001 , a 9-year-old professional assassin, mercenary, scientist, and scholar of the magic arts trained and conditioned at birth to have superior intellect and physical might and to especially be completely ruthless and efficient in killing, is suddenly tasked by his masters to be the bodyguard of the young lady Sophia Rosewood of the Rosewood marquess household, although perturbed by this he would soon realize exactly what kind of situation he’s in.