In the medical setting of child and adolescent psychiatry, therapists are involved with the children for a long time and have to select timely therapeutic techniques. Psychoanalytic developmental theories give therapists clues as to what children have not experienced until the therapy is started. I held special group psychotherapy sessions. The members in the group psychotherapy sessions had been isolated from their peers and families. The group members experienced a sense of security in that they were directly accepted and cherished by the group by receiving special treatment from the staff and the other members of the psychotherapy group.
 I herein report the process of group psychotherapy for children with neurodevelopmental disorders that exhibited long-term maladaptation or who were hikikomori. Group psychotherapy is important for them to resume peer group experiences.
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