Language school for business skills

Hi everyone, I’m moving to Japan from Germany on a working visa in August/September. I passed the JLPT N3 a few years ago and I’m currently around N2 level. My job itself doesn’t really require Japanese, but I feel like I’m lacking business communication skills, especially things like writing emails, understanding workplace etiquette, and generally navigating Japanese business culture. Does anyone know any language schools, courses or institutions that specifically teach these kinds of business skills after work hours? So far, I’ve mostly found full-time programs that combine regular language classes with job hunting support, but that’s not really possible for me since I’ll already be working full-time. Would love to hear if anyone has personal experience or recommendations!