Your Japanese studies faculty teach your electives. They are instructors at the host university, and are accustomed to teaching international students of all kinds.
The Resident Director helps you get the most out of the program. She handles housing, excursions, and day-to-day logistics, and is trained in emergency prevention and management. Got an idea for an activity? Need to see a doctor? Just want someone to talk to? The Resident Director is your best resource.