Most autism research has been conducted in Western settings. It is not clear, however, whether autistic experiences reported in Western cultures can be translated to those of East Asian autistic people. We aimed to bridge this gap by examining the lived experiences of autistic people in Japan. We used semi-structured interviews with seven autistic Japanese adults, who had been clinically diagnosed in their 20s and 30s, eliciting their experiences of growing up autistic, from their time at elementary school to the time of interview. Using reflexive thematic analysis, we identified three themes: (1) feeling different and misunderstood, (2) the different pathways and impact of diagnosis, and (3) a strong desire to be accepted. All interviewees experienced significant hardship throughout their lives, including being bullied by peers, workplace discrimination and a lack of acceptance of their diagnosis from their families. While this took its toll on interviewee’s mental health, they strongly desired to be understood by others and to address stigma. Stigma towards autism has received little attention in Japan. We suggest increasing the awareness and acceptance of autism through the lens of neurodiversity and involving the autistic community in research.