The world’s greatest assassin has been reincarnated as the eldest son of the Touahade family, an assassin noble family. The skills, experience, and knowledge of his previous life, the secret techniques and magic of the assassin noble Touahade, all work together to create a synergistic effect, and he grows into an assassin who can kill even gods. A good assassin knows everything. He is usually admired as an ideal lord, but behind the scenes he wields a knife as an assassin nobleman.