This study analyzes the motives and school experiences of parents who chose a growth school, a kind of foster alternative school established by the City Office of Education, which established students, parents, and teachers as equal subjects constituting school management, curriculum, and classes. I did it. The research method attempted an integrated approach that combined a quantitative questionnaire asking parents motivation for choosing a growing school and the meaning of their experiences and a qualitative method through in-depth interviews. The main research results are as follows: First, the parents choice of a school for growth was a departure from the mainstream education culture centered on the uniform entrance exam. Second, for parents, the growth school experience was meant as an opportunity to restore trust in school and teachers. Third, parents very positively evaluate the changes in their children s various competencies in the growing school. Lastly, parents showed that they are growing by reflecting on their parents roles through the experience of directly or indirectly participating in the operation of the growth school curriculum and their children s learning activities.