Mushoku Tensei: Jobless Reincarnation

Rudeus Greyrat is a thirty-four-year-old hikikomori in his first life and dies the day his late mother is buried, run over while trying to push the family parents out of a car's path. He wakes up an infant in a sword-and-magic continent, with full memory of who he was and the bone-deep determination to use the second chance properly. The first season covers his childhood: precocious mastery of magic theory at three, the home tutor Roxy who teaches him incantation, the prodigy swordswoman Eris he is hired to babysit, and the global mana calamity that scatters his family across the continent.