The easiest way by far to explore Otaki, and the Kiso Valley in general, is with a car.
Rental cars are available from JR Rent-A-Car just outside Kiso-Fukushima Station:
When checking availability, under Pickup Office, choose Koushinetsu from the area list. Then under the office list choose Nagano: Kiso-Fukushima
Buses that stop near Otaki’s sacred falls run between Kisofukushima Station and Tanohara-koen (beneath Ontake’s summit) via Otaki’s village center three times daily from November until the end of June. They only run on weekends from July to October. Contact us if you need the times.