Hamaguchi is the key person in the label “THE RAIN-MAKER.” 

As a vocal coach, he teaches many vocalists, anime song singers, and voice acting students as a part of his label’s activities:

  • Original technique as an anime song singer
  • Original performance as an anime song singer
  • Original feeling as an anime song singer

His unique theory, which is based on his own personal life experiences and professional experiences as a vocalist, and his relevant and effective teaching method gained the tremendous trust of his students.