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.