I'm looking for a manga about a salaryman who got headhunted by Maou and isekaied. Maou recognized MC's work experience (negotiating, overcoming cultural differences etc.) and hired him as his new general. Before moving isekai, our salaryman was wronged by his company and they sent him abroad to oversee a factory in Vietnam. He still managed to make the most out of the post, but then he got run over by a granny on a moped.

Somehow, I've managed to find it. It's Salaryman Ga Isekai Ni Ittara Shitennou Ni Natta Hanashi.