Looking for Spanish-speaking guide recommendations in Japan (Koyasan + other cities)

Hi everyone!
I’m traveling to Japan in late October with my family (we all speak Spanish) and looking for Spanish-speaking guides, especially for a day trip to Koyasan (we’ll rent a car from Osaka).

If you have direct contacts (or agencies) for Koyasan or other places like Nikko, Mt. Fuji, Tokyo, Osaka, or Kyoto, I’d love to hear your recommendations — ideally someone knowledgeable about history and culture who can make the visit engaging for Spanish speakers.

Thanks in advance! 🙏