Mushoku Tensei: Jobless Reincarnation (Manga) Vol. 3

When an unemployed 34 year old otaku reaches a dead end in life and decides that it's time to turn a over a new leaf he gets run over by a truck and dies! Shockingly, he finds himself reborn into an infant's body in a strange, new world of swords and magic. His new identity is Rudeus Grayrat, but he still retains the memories of his previous life.