Looking for trombone classes in Tokyo

Hi.

My son has started playing the Trombone after 8 years playing the piano. He is 15 years old.

I am looking for a teacher who could teach him the fundamentals with this new type of instrument

.He would also need reinforcement in Music Theory. He is very creative but need to go back to the books if he wants to get to the next level in his musical journey. We live in Meguro.

 Let me know