Homeless Tensei: Isekai de Jiyuu Sugiru Majutsu Jisoku Seikatsu

Shinichi Tanaka, once the representative director of a major company, is now homeless, with no family or money. After lightning strikes him on a rainy day, he wakes in an unfamiliar place in the body he had at age 25, though he is actually 56. He has been reincarnated in another world, but the nature of the strange place where he awakens remains a mystery. There, Shinichi begins a freewheeling life of self-sufficiency amid a bizarre and turbulent adventure.