Middle-Aged Businessman, Arise in Another World! Volume 2 by Sai Sumimori

Having successfully brought Elunheine Adventurer's Guild to the top of the adventuring industry in the fortress city of Treia, Onigawara Shouzou wastes no time in setting his sights on an even bigger title: top of the country! Along the way, he finds himself dealing with more dragons, royalty, international intrigue, and... child education? Armed with his characteristic business acumen and incredible OPness, he faces everything head on together with his beloved family, wacky coworkers, wise dad friends, and a whole new cast of colorful characters!