Transactional Analysis (TA) is a theory of personality and a systematic psychotherapy for personal growth and personal change. Because TA can enhance students’ practical abilities of communication and career design, it should be learned as a liberal art. However, it is difficult to teach TA to every student, so I introduced the Moomin stories as teaching materials for TA because the stories are agreeable to everyone and the intention is shared with the goal of TA. TA has seven areas, so I constructed seven units of two lessons each, one for explaining each area and the other for analyzing the story using the area’s knowledge and skills. The effect was assessed via a questionnaire, and the results indicated that analyzing the stories was superior to analyzing oneself with regard to the following five points: easiness, objectivity, carefreeness, deep reflection and variety. However, I need to improve the point of correctiveness. In the future, the effects must be assessed statistically and a follow-up survey needs to be designed.