This study explores the characteristics of 10 Japanese master therapists who gained the largest number of nominations from Japanese psychotherapists. Qualitative data analysis was processed utilizing the grounded theory approach and the consensual qualitative research method. Results clarified important characteristics of Japanese master therapists. First, as a foundation, they possess positive personality traits, such as modesty, warmth, sincerity, absence of self-centeredness, and resilience. Second, they possess an exceptional ability to perceive and process various cognitive and emotional information from the client, from the therapist him- or herself, and from the therapy process. Third, master therapists are able to continuously learn from their experiences, stimulated by their curiosity and creativity, as well as their sense of responsibility and discipline as professionals. Finally, cross-cultural comparison of Japanese and American master therapists are discussed, a model of master therapist development is proposed, and suggestions for future research and therapist training are offered.