Isekai fantasy manga are all too often power fantasies for their readers, and sometimes those power fantasies can go in some obnoxious or dark directions. A lot of manga adaptations try to fix them, but as shown in today's example it's not always successful.
MUSHOKU TENSEI: JOBLESS REINCARNATION (Mushoku Tensei: Isekai Ittara Honki Dasu), based on the light novel series by Rifujin na Magonote with art by Yuka Fujikawa. First published in 2014 and first published in North America in 2015.
PLOT:
Once he was a hopeless NEET. Then he was hit by a truck in an attempt to save some teens, and all he can wish for is for a second chance. He gets it when he is reborn as Rudeus Greyrat, the child of two adventurers with a precocious knack for magic. Under the tutelage of his tutor Roxy and his friend Sylphie, his power grows stronger, but what will happen when he needs to leave home to keep learning?