A follow-up study was conducted on young adults who previously participated in the group psychotherapy for children with developmental difficulties, "Moku-moku group". 15 young adults were assessed levels of intellectual development by WISC-III or WAIS-III, levels of adaptation by others evaluation scales, and they were interviewed using semi-structured questions. As results, we found that participants have intellectual discrepancy, and problems about interactions. On the other hand, adaptation in school or work is good, thus it was considered group psychotherapy was effective adaptation in adolescence. An analysis of interviews found that the group had sense of safeness and belongingness, and participants gradually found purpose and implication about group psychotherapy by themselves. Consciousness to other children was quite different by the participants, and it is necessary to examine relationship between the processes of psychotherapy and development of consciousness to others.