This is a case study that analyzed the results of counseling of a 16 year old student in his second year in middle school with the researcher of the study. The subject in this case study had been diagnosed and received treatment for obsessive-compulsive disorder at a youth psychiatric hospital when he showed signs of anxiety and worrying after being assaulted by his peers at a retreat for first year students in April, punished by a group of his peers for denying that he stole a classmate\'s exercise book in October. The student\'s mother requested counseling via phone. The counseling sessions began in August 2009 and continued for the following 4 months until November 2009 for 11 sessions. Among the stroke techniques of transactional analysis, we applied unconditional stroke and conditional stroke to verbal stroke and non-verbal stroke techniques to allow the subject to be at ease and to gain confidence in interpersonal relationships. Although this case study has limitations of objectivity as it is a single case, it can be said to have demonstrated that the stroke technique of transactional analysis can be used to improve interpersonal relationships of adolescents with an obsessive-compulsive disorder resulting from group pressure by helping them gain a peace of mind. We hope that an accumulation of successful cases of similar stroke technique application provides an opportunity for the need and importance of positive stroke to be applied to adolescents who are forming their ego to be seen in a new light.