Moto Isekai Ten'isha datta Kachou no Ojisan, Jinsei Nidome no Isekai o Kakemawaru

Souya, the manager of a trading company in a small city, is a 37-year-old office worker who enjoys single life. One day, when he wakes up in a strange meadow, he sees two moons floating in the night sky and regains the memory of being transferred to another world 20 years ago. An uncle's adventure in a different world, wearing a business suit, with a low amount of tension, a high level of ability, and a cool but slightly pathetic personality.

(Source: Shousetsuka ni Narou, translated)

Note: An extra chapter is included.