Although there was no Korean guide, the staff kindly explained the meeting time and itinerary to me personally in English. The schedule wasn't too tight, and they gave us plenty of time. We went to ride the Amaterasu Railway, booked tickets, and after seeing the Takachiho Gorge, we came back to ride the Amaterasu train again. The railway itself wasn't particularly exciting, but it was still nice. Haha, the gorge was also wonderful. You can just follow the guide. Even if you're a bit late taking photos, you can find the guide's yellow flag, and they also told us when and where to meet for the return journey. They even kindly took photos for us. Then, they gave us time for lunch and plenty of time to look around Kusasenri. After that, we went to the Nakadake crater, but unfortunately, access was restricted, so we only saw it from below. Still, it was really good. I highly recommend this tour.