One of the best hitman on earth, earned the nickname "The Walking Disaster", bad luck has clung to him since childhood, but his skill were top class and was considered a living weapon by the government. While tasked to eliminate a prominent individual he was betrayed by his partner in turn leading to his death. His soul inevitably sucked into another world reincarnating him into a baby still intact with his previous memories, skills, and knowledge of his past life all the trauma and training. All the more this world is a world of sword, magic, and.. Monstrous beasts? It doesn't help that the power that is bestowed on him is next to nothing? it seems his bad luck has carried over to this world as well. How will a highly trained assassin that only knows how to kill maneuver through this world? How will he find out the purpose for this reincarnation?