Arafoo Otoko no Isekai Tsuhan Seikatsu

Kenichi, a single man in his 40s, is transported into another world for no apparent reason. As he tries to escape a dangerous forest teaming with monsters, he realizes he has the power to access to a huge online store. By using this power to exchange goods he found in this new world for cash, and then buying modern ones off the internet, he was able to quickly create a very popular business. However, his goal is to have a slow and leisurely life.