Swan Dive Riot

The Greatest Hitman of all time named the walking disaster by his colleagues because of the unfortunate things that happened to him. He is considered a living weapon by the government, while tasked to eliminate a prominent individual he was suddenly betrayed by his partner getting him killed. His soul suddenly sucked into another world reincarnating him into a baby still intact with his previous memories, skills, and knowledge of his past life. All the more this world is a world of sword, magic, and.. Monstrous beasts? It doesn't help that the power bestowed on him is next to nothing. How will he maneuver through this world? How will he find out the reason for this reincarnation?